A174302 - OEIS

A174302

Riordan array ((1-x^2c(x)^2)/(1-xc(x)-x^2c(x)^2),xc(x)), c(x) the g.f. of A000108.

1, 1, 1, 2, 2, 1, 6, 5, 3, 1, 19, 15, 9, 4, 1, 63, 48, 29, 14, 5, 1, 215, 160, 97, 49, 20, 6, 1, 749, 548, 333, 173, 76, 27, 7, 1, 2650, 1914, 1165, 617, 284, 111, 35, 8, 1, 9490, 6785, 4135, 2221, 1056, 439, 155, 44, 9, 1

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OFFSET

0,4

COMMENTS

First row is essentially A109262.

LINKS

Table of n, a(n) for n=0..54.

EXAMPLE

Triangle begins

1, 1,

2, 2, 1,

6, 5, 3, 1,

19, 15, 9, 4, 1,

63, 48, 29, 14, 5, 1,

215, 160, 97, 49, 20, 6, 1,

749, 548, 333, 173, 76, 27, 7, 1,

Production matrix begins

1, 1,

1, 1, 1,

2, 1, 1, 1,

2, 1, 1, 1, 1,

3, 1, 1, 1, 1, 1,

3, 1, 1, 1, 1, 1, 1,

4, 1, 1, 1, 1, 1, 1, 1

CROSSREFS

Sequence in context: A130469 A106381 A064784 * A108074 A189175 A271776

Adjacent sequences: A174299 A174300 A174301 * A174303 A174304 A174305

KEYWORD

easy,nonn,tabl

AUTHOR

Paul Barry, Mar 15 2010

STATUS

approved