This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A010091 #19 Jul 08 2025 01:29:34
%S A010091 1,0,1085,22568,247845,1383096,4414865,8280720,9398115,6440560,
%T A010091 2648919,628680,82615,5208,155
%N A010091 Weight distribution of d=4 Hamming code of length 31.
%D A010091 F. J. MacWilliams and N. J. A. Sloane, The Theory of Error-Correcting Codes, Elsevier-North Holland, 1978, p. 129.
%F A010091 a(n) = A010086(2n). - _Alois P. Heinz_, Jul 14 2020
%t A010091 m:=31; RecurrenceTable[{a[n]==(Binomial[m, n-1]-a[n-1]-(m-n+2)*a[n-2])/n, a[0]==1, a[1]==0}, a, {n, 0, m}][[1;;m-2;;2]] (* _Georg Fischer_, Jul 14 2020; from the ref. p. 129 *)
%Y A010091 Cf. A010086.
%K A010091 nonn,fini,full
%O A010091 0,3
%A A010091 _N. J. A. Sloane_