A256512 - OEIS

%I #6 Aug 05 2021 12:28:03

%S 0,3,34,651,16388,500005,17915910,737894535,34359738376,1785233613321,

%T 102400000000010,6427501315524619,438244169232678924,

%U 32254987351648575501,2548827677619195478030,215233605000000000000015,19342813113834066795298832

%N n*(1+(2*n)^n).

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

%H Reinhard Zumkeller, <a href="/A256512/b256512.txt">Table of n, a(n) for n = 0..250</a>

%t Join[{0},Table[n(1+(2n)^n),{n,20}]] (* _Harvey P. Dale_, Aug 05 2021 *)

%o (Haskell)

%o a256512 n = n * (1 + (2 * n) ^ n)

%Y Cf. A062971, A108396, A108398.

%K nonn

%O 0,2

%A _Reinhard Zumkeller_, Mar 31 2015