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%I #12 Jan 04 2021 07:48:13
%S 0,1,1,2,3,5,8,13,23,39,69,123,219,396,719,1313,2406,4435,8215,15260,
%T 28431,53167,99774,187615,353500,667874,1264854,2399207,4557831,
%U 8675836,16544234,31587644,60382450,115601178,221625505,425313967
%N Next-to-middle coefficient in expansion of Product_{k=1..n} (1 + x^k).
%o (PARI) a(n) = polcoeff(prod(k=1, n, 1+x^k), n*(n+1)\4 - 1); \\ _Michel Marcus_, Jan 04 2021
%Y Cf. A025591 for middle coefficient.
%K nonn
%O 1,4
%A _N. J. A. Sloane_, Mar 24 2002
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