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a(1)=1, a(n) = 2(n^(n-1)-1)/(n-1)^2.
1

%I #8 Aug 26 2015 20:58:00

%S 1,2,4,14,78,622,6536,85598,1345210,24691358,518748492,12281130094,

%T 323584515590,9393074239694,297887000259088,10248191152060862,

%U 380165561528647410,15127415638330079806,642761421592044700820

%N a(1)=1, a(n) = 2(n^(n-1)-1)/(n-1)^2.

%t Insert[Table[2*(n^(n - 1) - 1)/(n - 1)^2, {n, 2, 20}], 1, 1] (* _Stefan Steinerberger_, Mar 18 2006 *)

%Y Cf. A093460, A093461.

%K nonn

%O 1,2

%A _Amarnath Murthy_, Apr 05 2004

%E Corrected and extended by _Stefan Steinerberger_, Mar 18 2006