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Expansion of B(x)^2, where B(x) is the g.f. of A108482.
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%I #10 Aug 03 2024 07:10:28

%S 1,2,3,2,-1,-4,-4,0,7,10,5,-8,-20,-18,1,28,40,20,-25,-64,-59,2,81,114,

%T 55,-74,-178,-158,9,220,301,144,-183,-444,-390,16,518,706,330,-430,

%U -1019,-884,46,1170,1575,738,-931,-2202,-1902,84,2460,3292,1523,-1938,-4541,-3888,186,4994,6646,3066,-3842

%N Expansion of B(x)^2, where B(x) is the g.f. of A108482.

%F G.f.: C(x) / D(x), where C(x) is the g.f. of A375148 and D(x) is the g.f. of A375159.

%o (PARI) my(N=70, x='x+O('x^N)); Vec(prod(k=1, N, (1-x^(7*k-3))*(1-x^(7*k-4))/((1-x^(7*k-1))*(1-x^(7*k-6))))^2)

%Y Cf. A108482, A375148, A375159.

%K sign

%O 0,2

%A _Seiichi Manyama_, Aug 03 2024