A123306 Column 0 of triangle A123305.

1, 1, 2, 6, 26, 156, 1234, 12340, 150994, 2204112, 37617314, 738465620, 16451763834, 411281292920, 11427727238034, 350040470610996, 11736423864328466, 428080429306305136, 16893650334361392866

Offset

0,3

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 shift left equals column 0 of T^2.

Links

Table of n, a(n) for n=0..18.

Crossrefs

Cf. A123305; A123307, A123308, A123309; A123310, A123311.

Sequence in context: A141761 A355206 A242574 * A218691 A099758 A099760

Adjacent sequences: A123303 A123304 A123305 * A123307 A123308 A123309

Keyword

nonn

Author

Paul D. Hanna, Sep 24 2006

Status

approved