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G.f.: A(x) = (1 + 21*x + 3*x^2 - x^3)/(1-x)^5.
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%I #7 Mar 12 2022 13:23:33

%S 1,26,123,364,845,1686,3031,5048,7929,11890,17171,24036,32773,43694,

%T 57135,73456,93041,116298,143659,175580,212541,255046,303623,358824,

%U 421225,491426,570051,657748,755189,863070,982111,1113056,1256673

%N G.f.: A(x) = (1 + 21*x + 3*x^2 - x^3)/(1-x)^5.

%F Column 1 of triangle A183065.

%o (PARI) {a(n)=polcoeff((1+21*x+3*x^2-x^3)/(1-x+x*O(x^n))^5,n)}

%Y Cf. A183065, A183067, A183068.

%K nonn

%O 0,2

%A _Paul D. Hanna_, Dec 22 2010