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A107723 Column 0 of triangle A107722. 0
1, 2, 12, 114, 1446, 22722, 424302, 9168162, 224961774, 6180211842, 187977996366, 6272676296034, 227890380810606, 8955881754461250, 378593286191735694, 17131977268344445218, 826338384025220612526, 42323768184940929568770 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

Shift left 1 place equals twice column 1 of triangle A107717.

LINKS

Table of n, a(n) for n=0..17.

PROG

(PARI)

CROSSREFS

Cf. A107717, A107722.

Sequence in context: A141141 A128571 A052696 * A258175 A225797 A302286

Adjacent sequences:  A107720 A107721 A107722 * A107724 A107725 A107726

KEYWORD

nonn

AUTHOR

Paul D. Hanna, May 30 2005

STATUS

approved

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Last modified February 25 19:39 EST 2021. Contains 341618 sequences. (Running on oeis4.)