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 A187305 #9 Jul 22 2025 10:41:50 %S A187305 0,0,0,3096,44824,187924,505878,1044900,1847506,2912204,4254568, %T A187305 5853664,7715596,9827696,12192058,14805028,17667036,20777536,24136566, %U A187305 27744092,31600114,35704632,40057646,44659156,49509162,54607664,59954662,65550156 %N A187305 Number of 10-step one space leftwards or up, two space rightwards or down asymmetric rook's tours on an n X n board summed over all starting positions. %C A187305 Row 10 of A187296 %H A187305 R. H. Hardin, <a href="/A187305/b187305.txt">Table of n, a(n) for n = 1..50</a> %F A187305 Empirical: a(n) = 124248*n^2 - 1238146*n + 2807812 for n>17 %K A187305 nonn %O A187305 1,4 %A A187305 _R. H. Hardin_ Mar 08 2011