A123309 Column 3 of triangle A123305.

1, 4, 32, 336, 4256, 63072, 1076128, 20900032, 457645984, 11201485632, 304074996512, 9089787596288, 297305835048096, 10578368788224320, 407327197600166304, 16894650230806939776, 751638529171350907808

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 4 times column 3 of T^2 (matrix square of A123305).

Links

Table of n, a(n) for n=0..16.

Crossrefs

Cf. A123305; A123306, A123307, A123308; A123310, A123311.

Sequence in context: A272823 A371655 A002005 * A186391 A231446 A137432

Adjacent sequences: A123306 A123307 A123308 * A123310 A123311 A123312

Keyword

nonn

Author

Paul D. Hanna, Sep 25 2006

Status

approved