A202176 - OEIS

A202176

Array read by antidiagonals of covering numbers rho_n(k).

1, 1, 1, 1, 2, 1, 1, 2, 3, 1, 1, 3, 4, 4, 1, 1, 3, 6, 6, 5, 1, 1, 4, 9, 12, 9, 6, 1, 1, 4, 12, 18, 29, 12, 7, 1, 1, 5, 15, 27, 33, 30, 16, 8, 1, 1, 5, 18

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

OFFSET

1,5

LINKS

Table of n, a(n) for n=1..48.

B. Babcock and A. van Tuyl, Revisiting the spreading and covering numbers, arXiv preprint arXiv:1109.5847 [math.AC], 2011.

EXAMPLE

Array begins:

1 1 1 1 1 1 1 1 1 1 1 ...

1 2 2 3 3 4 4 5 5 6 6 ...

1 3 4 6 9 12 15 18 23 27 32 ...

4 6 12 18 27 [32-38] ...

...

CROSSREFS

Row 3 is A202171. Cf. A202175.

Sequence in context: A275416 A037161 A202175 * A168443 A156041 A306210

Adjacent sequences: A202173 A202174 A202175 * A202177 A202178 A202179

KEYWORD

nonn,tabl,more

AUTHOR

N. J. A. Sloane, Dec 13 2011

STATUS

approved