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 A375303 #4 Aug 26 2024 09:52:15 %S A375303 0,1,4,20,108,678,4848,39264,355920,3575640,39454560,474501600, %T A375303 6178566240,86606881200,1300352981760,20821540239360,354184575816960, %U A375303 6378546460970880,121243261343500800,2425719783585369600,50955334461183398400,1121303792572973856000,25795667534014525593600 %N A375303 a(n) is the rank of row n of A130517 in a lexicographic permutation of [1, ..., n]. %o A375303 (PARI) \\ uses functions a130517_row from A130517 and rank from A375302. %o A375303 a(n) = rank(a130517_row(n)) %Y A375303 Cf. A130517, A375302. %K A375303 nonn %O A375303 1,3 %A A375303 _Hugo Pfoertner_, Aug 26 2024