A210692 - OEIS

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A210692

Number of parts that are visible in one of the three views of the shell model of partitions with n regions mentioned in A210991.

1

1, 3, 6, 6, 11, 11, 18, 18, 18, 18, 29, 29, 29, 29, 44, 44, 44, 44, 44, 44, 44, 66, 66, 66, 66, 66, 66, 66, 66, 96, 96, 96, 96, 96, 96, 96, 96, 96, 96, 96, 96, 138, 138, 138, 138, 138, 138, 138, 138, 138, 138, 138, 138, 138, 138, 194, 194, 194, 194, 194, 194, 194, 194, 194, 194, 194, 194, 194, 194, 194

(list; graph; refs; listen; history; text; internal format)

OFFSET

1,2

COMMENTS

For the definition of "regions of n" see A206437.

LINKS

Table of n, a(n) for n=1..70.

FORMULA

a(A000041(n)) = A026905(n).

EXAMPLE

Written as a triangle begins:

1,

3,

6,

6, 11,

11,18,

18,18,18,29,

29,29,29,44,

44,44,44,44,44,44,66,

66,66,66,66,66,66,66,96,

96,96,96,96,96,96,96,96,96,96,96,138;

CROSSREFS

Row j has length A187219(j). Right border gives A026905.

Cf. A000041, A135010, A138121, A182703, A186114, A194803, A194805, A206437, A210991.

Sequence in context: A203330 A197442 A113497 * A158662 A119980 A066779

Adjacent sequences: A210689 A210690 A210691 * A210693 A210694 A210695

KEYWORD

nonn,tabf

AUTHOR

Omar E. Pol, May 24 2012

STATUS

approved