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A117423 Column 5 of triangle A117418. 6
1, 6, 28, 126, 572, 2692, 13203, 67542, 360117, 1999817, 11541894, 69098409, 428183782, 2742315847, 18117294723, 123222721469, 861339730328, 6179291890400, 45431581077388, 341893183760356, 2630537501336631 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..20.

CROSSREFS

Cf. A117418; A117419, A117420, A117421, A117422, A117424.

Sequence in context: A181337 A002693 A289779 * A171859 A084778 A287807

Adjacent sequences:  A117420 A117421 A117422 * A117424 A117425 A117426

KEYWORD

nonn

AUTHOR

Paul D. Hanna, Mar 14 2006

STATUS

approved

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Last modified October 21 08:47 EDT 2019. Contains 328292 sequences. (Running on oeis4.)