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A123306 Column 0 of triangle A123305. 7
1, 1, 2, 6, 26, 156, 1234, 12340, 150994, 2204112, 37617314, 738465620, 16451763834, 411281292920, 11427727238034, 350040470610996, 11736423864328466, 428080429306305136, 16893650334361392866 (list; graph; refs; listen; history; text; internal format)
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: A107104 A141761 A242574 * A218691 A099758 A099760

Adjacent sequences:  A123303 A123304 A123305 * A123307 A123308 A123309

KEYWORD

nonn

AUTHOR

Paul D. Hanna, Sep 24 2006

STATUS

approved

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Last modified April 6 08:44 EDT 2020. Contains 333268 sequences. (Running on oeis4.)