login
a(n)=A006125(n+1)*2^A001840(n).
2

%I #4 Mar 30 2012 18:59:28

%S 1,4,32,512,32768,4194304,1073741824,1099511627776,2251799813685248,

%T 9223372036854775808,151115727451828646838272,

%U 4951760157141521099596496896,324518553658426726783156020576256,85070591730234615865843651857942052864

%N a(n)=A006125(n+1)*2^A001840(n).

%C Hankel transform of A186338.

%F a(n)=2^binomial(n+1,2)*2^floor((n+1)(n+2)/6).

%K nonn,easy

%O 0,2

%A _Paul Barry_, Feb 18 2011