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 A213454 N2026 #9 Mar 22 2024 18:41:37 %S A213454 0,0,0,0,1,10,99,1024,11234,132269,1670481,22586759,326104782, %T A213454 5012334813,81773199730,1411970823695,25734352973795,493835621908325, %U A213454 9954533195180673,210325338388169070,4648654469101584811,107281499755284506084 %N A213454 a(n) = A001253(n)/2. %D A213454 F. N. David, M. G. Kendall and D. E. Barton, Symmetric Function and Allied Tables, Cambridge, 1966, p. 262. (Terms for n>=13 are incorrect). %D A213454 N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence). %Y A213454 Cf. A001253. %K A213454 nonn %O A213454 1,6 %A A213454 _N. J. A. Sloane_, Jun 12 2012