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a(n) = Sum_{k=0..binomial(n,2)} (-1)^k*A152534(n,k).
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%I #20 Aug 09 2021 16:23:58

%S 1,1,1,2,3,6,10,23,47,110,246,617,1602,4035,11481,29927,95503,249926,

%T 871030,2316317,8879558,23674841,98329551,264329177,1191578522,

%U 3207278255,15543026747,42011308653,218668538441,591460307157,3285749117475,8905905152798,52700813279423

%N a(n) = Sum_{k=0..binomial(n,2)} (-1)^k*A152534(n,k).

%H Alois P. Heinz, <a href="/A152536/b152536.txt">Table of n, a(n) for n = 0..100</a>

%p A152536 := proc(n)

%p add( (-1)^k*A152534(n,k),k=0..binomial(n,2)) ;

%p end proc: # _R. J. Mathar_, Jun 15 2013

%Y Cf. A152534.

%K nonn

%O 0,4

%A _Vladeta Jovovic_, Dec 06 2008

%E a(17)-a(20) from _Vaclav Kotesovec_, May 24 2020

%E a(0), a(21)-a(32) from _Alois P. Heinz_, Aug 09 2021