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%I #2 Mar 31 2012 13:21:56

%S 1,0,0,0,0,1,5,16,50,137,377,995,2617,6785,17630,45646,118595,308645,

%T 806617,2115455,5572438,14737430,39139779,104354064,279293860,

%U 750182992,2021884234,5466813137,14826008106,40322237818,109957234707

%N A000055(n+2)-A023359(n).

%Y Cf. A000055, A023359.

%K nonn

%O 0,7

%A _Jon Perry_, Jun 22 2003