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A123307 Column 1 of triangle A123305. 7
1, 2, 8, 44, 312, 2776, 30312, 397728, 6151768, 110306160, 2260463464, 52304514912, 1352534122104, 38742215685776, 1219910431007656, 41945588389187712, 1565744883592488856, 63123204175617586000 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

Triangle T=A123305 is defined by: (column k of T) = (k+1)*(column k of T^2) shifted to have an initial '1'; thus this sequence shifted left equals twice column 1 of T^2 (matrix square of A123305).

LINKS

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

CROSSREFS

Cf. A123305; A123306, A123308, A123309; A123310, A123311.

Sequence in context: A321628 A005363 A216234 * A293905 A244430 A190818

Adjacent sequences:  A123304 A123305 A123306 * A123308 A123309 A123310

KEYWORD

nonn

AUTHOR

Paul D. Hanna, Sep 24 2006

STATUS

approved

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Last modified May 20 03:10 EDT 2019. Contains 323412 sequences. (Running on oeis4.)