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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
CROSSREFS
Sequence in context: A321628 A005363 A216234 * A293905 A244430 A190818
KEYWORD
nonn
AUTHOR
Paul D. Hanna, Sep 24 2006
STATUS
approved

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Last modified March 29 10:22 EDT 2024. Contains 371268 sequences. (Running on oeis4.)