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A123308 Column 2 of triangle A123305. 7
1, 3, 18, 144, 1422, 16848, 235458, 3827628, 71466174, 1515031920, 36091609434, 957367079244, 28050237910926, 901359663633000, 31567805908329330, 1198307340146774844, 49060139971072916142, 2156816501291429473248 (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 3 times column 2 of T^2 (matrix square of A123305).
LINKS
CROSSREFS
Sequence in context: A107708 A224992 A289428 * A177383 A074525 A118331
KEYWORD
nonn
AUTHOR
Paul D. Hanna, Sep 24 2006
STATUS
approved

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Last modified March 29 07:27 EDT 2024. Contains 371265 sequences. (Running on oeis4.)