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 A001885 M0384 N0144 #20 Dec 23 2021 22:45:49 %S A001885 2,2,10,28,207,1288,10366,91296,903037,9832848,117032570,1510932116, %T A001885 21028774738,313832463386,4999133311044,84655108256252, %U A001885 1518546437350265,28763765236019284,573689119174695326,12017485839703597024,263787711208968183879,6054632852404055079936 %N A001885 Hit polynomials. %D A001885 J. Riordan, The enumeration of permutations with three-ply staircase restrictions, unpublished memorandum, Bell Telephone Laboratories, Murray Hill, NJ, Oct 1963. (See A001883). %D A001885 N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence). %D A001885 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence). %H A001885 N. J. A. Sloane, <a href="/A001883/a001883_21.pdf">Annotated copy of Riordan's Three-Ply Staircase paper</a> (unpublished memorandum, Bell Telephone Laboratories, Murray Hill, NJ, Oct 1963) %Y A001885 Third column of A080018. %Y A001885 Cf. A001883-A001891. %K A001885 nonn %O A001885 2,1 %A A001885 _N. J. A. Sloane_ %E A001885 More terms from Vladeta Jovovic and _Vladimir Baltic_, Jan 20 2003 %E A001885 a(21)-a(23) from _Vaclav Kotesovec_, Oct 10 2017