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 A001888 M3573 N1449 #24 Dec 23 2021 22:44:26 %S A001888 1,1,1,4,21,122,849,6719,59873,593686,6483027,77309508,999569969, %T A001888 13927664613,208044077633,3316415176712,56193522437465, %U A001888 1008499234742158,19110533105114433,381290148293261075,7989548583615385153,175418232627066361514,4027213499971769192903,96489861550805864197512 %N A001888 Hit polynomials. %D A001888 J. Riordan, The enumeration of permutations with three-ply staircase restrictions, unpublished memorandum, Bell Telephone Laboratories, Murray Hill, NJ, Oct 1963. (See A001883) %D A001888 N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence). %D A001888 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence). %H A001888 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 (unpublished memorandum, Bell Telephone Laboratories, Murray Hill, NJ, Oct 1963) %Y A001888 Second column of A080061. %Y A001888 Cf. A001883-A001891. %K A001888 nonn %O A001888 1,4 %A A001888 _N. J. A. Sloane_ %E A001888 More terms from _Vladeta Jovovic_, _Vladimir Baltic_, Jan 23 2003 %E A001888 a(21)-a(24) from _Vaclav Kotesovec_, Oct 10 2017