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%I #3 Mar 24 2013 17:49:34
%S 1,0,4,24,224,2480,32448,488922,8343040,158976576,3346392320,
%T 77118115712,1931148192768,52214924020480,1516090021970944,
%U 47049148379742720
%N a(0)=1, a(1)=0, a(n)=2n(a(n-1)+a(n-2)), n>1.
%e a(2)= 4*(0+1)=4, a(3)=6*(4+0)=24, a(4)=8*(24+4)=224...
%K nonn
%O 0,3
%A _Gary Detlefs_, Jul 18 2010
%E Definition corrected by _Bruno Berselli_, Jul 20 2010
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