A123307 Column 1 of triangle A123305.

1, 2, 8, 44, 312, 2776, 30312, 397728, 6151768, 110306160, 2260463464, 52304514912, 1352534122104, 38742215685776, 1219910431007656, 41945588389187712, 1565744883592488856, 63123204175617586000

Offset: 0

Author

Paul D. Hanna, Sep 24 2006

Keywords

• nonn

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).

Crossrefs

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