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 A281441 #22 Oct 21 2017 22:07:40 %S A281441 1,0,1,1,0,1,0,4,0,1,4,0,7,0,1,0,25,0,10,0,1,25,0,57,0,13,0,1,0,196,0, %T A281441 98,0,16,0,1,196,0,522,0,148,0,19,0,1,0,1764,0,1006,0,207,0,22,0,1, %U A281441 1764,0,5206,0,1673,0,275,0,25,0,1 %N A281441 Triangle read by rows: T(n,r), 0 <= r <= n, is the number of idempotents of rank r in the Jones monoid J_n. %C A281441 Values were computed using the Semigroups package for GAP. %H A281441 Igor Dolinka, James East, Athanasios Evangelou, Desmond FitzGerald, Nicholas Ham, James Hyde, Nicholas Loughlin, <a href="https://arxiv.org/abs/1507.04838">Idempotent Statistics of the Motzkin and Jones Monoids</a>, arXiv:1507.04838 [math.CO], 2015-2016. %F A281441 T(2n,0) = T(2n+1,1) = A001246(n). T(2n+2,2n) = A016777(n). - _Andrey Zabolotskiy_, Oct 19 2017 %Y A281441 Cf. A225798 (row sums), A281442, A289620, A001246, A016777. %K A281441 nonn,tabl %O A281441 0,8 %A A281441 _James East_, Oct 05 2017