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A123312 a(n) = A123311(n)/(n+1), where A123311 forms the central terms of triangle A123305. 2
1, 1, 6, 84, 2010, 70596, 3331006, 199417056, 14559631506, 1259526351000, 126308710634414, 14434568970310656, 1854260500658184762, 264771440776810595320, 41635233706865669566110 (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 a(n) = A123311(n)/(n+1) is integer for n>=0.

LINKS

Table of n, a(n) for n=0..14.

CROSSREFS

Cf. A123305; A123306, A123307, A123308, A123309, A123310, A123311.

Sequence in context: A128575 A014062 A147626 * A010794 A177560 A177562

Adjacent sequences:  A123309 A123310 A123311 * A123313 A123314 A123315

KEYWORD

nonn

AUTHOR

Paul D. Hanna, Sep 25 2006

STATUS

approved

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Last modified May 23 02:46 EDT 2017. Contains 286909 sequences.