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A117420 Column 2 of triangle A117418. 6
1, 3, 8, 22, 65, 208, 723, 2721, 11053, 48220, 224548, 1109098, 5778541, 31599829, 180605494, 1074867617, 6641877097, 42500291653, 280917956733, 1913770121846, 13412187670519, 96528097452229, 712332226596238, 5382561715509703 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Table of n, a(n) for n=0..23.

CROSSREFS

Cf. A117418; A117419, A117421, A117422, A117423, A117424.

Sequence in context: A014138 A099324 A290898 * A003101 A064443 A000732

Adjacent sequences:  A117417 A117418 A117419 * A117421 A117422 A117423

KEYWORD

nonn

AUTHOR

Paul D. Hanna, Mar 14 2006

STATUS

approved

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Last modified October 15 10:57 EDT 2018. Contains 316222 sequences. (Running on oeis4.)