%I #7 Nov 18 2018 00:06:57
%S 1,3,17,127,1249,15551,235297,4194303,86093441,1999999999,51874849201,
%T 1486016741375,46596170244961,1587429546508287,58385852050781249,
%U 2305843009213693951,97322383751333736961,4371823119477393063935
%N a(n) = 2n^(n1)  1.
%C a(n) = A111568(n,n1), i.e., diagonal of A111568. A111568 is the triangle whose nth row contains n terms of the arithmetic progression having first term 1 and common difference 2*(n^(n1)1)/(n1).  _Emeric Deutsch_, Aug 08 2005
%p a:=n>2*n^(n1)1: seq(a(n),n=1..20); # _Emeric Deutsch_, Aug 08 2005
%t f[n_] := 2*n^(n1)  1; Table[f[i], {i, 1, 30}] (* _Ryan Propper_, Aug 08 2005 *)
%Y Cf. A093461, A111568.
%K nonn
%O 1,2
%A _Amarnath Murthy_, Apr 05 2004
%E More terms from _Emeric Deutsch_ and _Ryan Propper_, Aug 08 2005
