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%I #8 Aug 23 2022 09:45:58
%S 1,1,-1,1,0,1,0,3,1,7,4,19,17,63,77,217,326,815,1435,3533,7227,17709,
%T 39704,97010,228123,561216,1366962,3423504,8601350,22000341,56612480,
%U 147248370,384885631
%N a(n) = A000676(n) - A000677(n).
%H Jean-François Alcover, <a href="/A100584/b100584.txt">Table of n, a(n) for n = 0..100</a>
%F a(n) = A000055(n) - 2*A000677(n). - _Jean-François Alcover_, Aug 23 2022
%Y Cf. A000055, A000676, A000677.
%K sign
%O 0,8
%A _N. J. A. Sloane_, Dec 01 2004
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