A123311 Central terms of triangle A123305.

1, 2, 18, 336, 10050, 423576, 23317042, 1595336448, 131036683554, 12595263510000, 1389395816978554, 173214827643727872, 24105386508556401906, 3706800170875348334480, 624528505602985043491650

Offset: 0

Author

Paul D. Hanna, Sep 25 2006

Keywords

• nonn
• more

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 A123312(n) = a(n)/(n+1) is an integer for n>=0.

Crossrefs

Cf. A123305; A123306, A123307, A123308, A123309, A123310, A123312.