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 A381227 #14 Feb 25 2025 18:24:51 %S A381227 1,1,2,1,2,3,6,1,2,3,4,5,24,1,2,3,4,10,11,120,1,2,3,5,6,26,27,720,1,2, %T A381227 3,8,9,70,71,5040,1,2,3,4,14,15,200,201,40320,1,2,3,4,5,24,25,602,603, %U A381227 362880,1,2,3,6,7,43,44,1904,1905,3628800,1,2,3,8,9,79,80,6317,6318,39916800 %N A381227 Irregular triangle read by rows: row n lists the A381226(n) numbers constructed in the definition of A381226, in increasing order. %e A381227 Triangle begins: %e A381227 1; %e A381227 1, 2; %e A381227 1, 2, 3, 6; %e A381227 1, 2, 3, 4, 5, 24; %e A381227 1, 2, 3, 4, 10, 11, 120; %e A381227 1, 2, 3, 5, 6, 26, 27, 720; %e A381227 1, 2, 3, 8, 9, 70, 71, 5040; %e A381227 1, 2, 3, 4, 14, 15, 200, 201, 40320; %e A381227 1, 2, 3, 4, 5, 24, 25, 602, 603, 362880; %e A381227 1, 2, 3, 6, 7, 43, 44, 1904, 1905, 3628800; %e A381227 ... %Y A381227 Cf. A139004, A381226, A381228, A381229. %K A381227 nonn,tabf %O A381227 1,3 %A A381227 _N. J. A. Sloane_, Feb 25 2025