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A113573 A113572(n)/n. 2
1, 6, 41, 306, 2449, 20404, 174895, 1530303, 13602694, 0, 1112947677, 10202020369, 94172495711, 874458888747, 0, 76515152765153, 720142614260276, 6801346912458046, 64433812854865493, 0, 5829725924964020204, 55647383829202011022, 532279323583671409769, 5101010184343517676851, 0, 470862478554786247093941 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

a(5*t)=0 for t>1. Conjecture: No other term is zero.

LINKS

Sean A. Irvine, Table of n, a(n) for n = 1..1000

EXAMPLE

a(6) = 122424/6 =20404.

CROSSREFS

Cf. A113572.

Sequence in context: A143023 A078009 A127848 * A083161 A077147 A100770

Adjacent sequences:  A113570 A113571 A113572 * A113574 A113575 A113576

KEYWORD

base,easy,nonn

AUTHOR

Amarnath Murthy, Nov 06 2005

EXTENSIONS

Corrected and extended by R. J. Mathar, Aug 29 2007

Corrected and extended by Sean A. Irvine, Jan 17 2011

STATUS

approved

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Last modified May 18 17:28 EDT 2021. Contains 343996 sequences. (Running on oeis4.)