A256512 n*(1+(2*n)^n).

0, 3, 34, 651, 16388, 500005, 17915910, 737894535, 34359738376, 1785233613321, 102400000000010, 6427501315524619, 438244169232678924, 32254987351648575501, 2548827677619195478030, 215233605000000000000015, 19342813113834066795298832

Offset

0,2

Comments

a(n) = A108396(2*n,n): central terms of the triangle A108396.

Links

Reinhard Zumkeller, Table of n, a(n) for n = 0..250

Mathematica

Join[{0}, Table[n(1+(2n)^n), {n, 20}]] (* Harvey P. Dale, Aug 05 2021 *)

Prog

(Haskell)
a256512 n = n * (1 + (2 * n) ^ n)

Crossrefs

Cf. A062971, A108396, A108398.

Sequence in context: A126753 A047794 A332679 * A277391 A231850 A109521

Adjacent sequences: A256509 A256510 A256511 * A256513 A256514 A256515

Keyword

nonn

Author

Reinhard Zumkeller, Mar 31 2015

Status

approved