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 A374895 #10 Aug 04 2024 03:12:34 %S A374895 1,1,2,1,3,6,1,4,3,26,1,5,20,33,150,1,6,15,44,15,1082,1,7,42,115,380, %T A374895 273,9366,1,8,7,366,285,4108,1491,94586,1,9,72,91,4074,3535,17780, %U A374895 38001,1091670,1,10,45,776,70,11334,26355,269348,17295,14174522,1,11,110,531,10440,2149,189714,458555,4663060,566733,204495126 %N A374895 Array read by falling antidiagonals: T(n,k) = numerator(Sum_{x>0} (x^n)/(k^x)); n >= 0 and k >= 2. %F A374895 T(n,k) = numerator(polylog(-n, 1/k)). %F A374895 T(n,k) = numerator(1/(k-1)^(n+1) * Sum_{m=1..n} A008292(n,m)*k^m). %F A374895 T(0,k) = 1. %F A374895 T(1,k) = k. %F A374895 T(2,k) = A276805(k-1). %F A374895 T(n,2) = A000629(n). %F A374895 T(n,n) = A121376(n). %e A374895 Array begins: %e A374895 +-----+--------------------------------------------------------------+ %e A374895 | n\k | 2 3 4 5 6 7 8 ... | %e A374895 +-----+--------------------------------------------------------------+ %e A374895 | 0 | 1 1 1 1 1 1 1 ... | %e A374895 | 1 | 2 3 4 5 6 7 8 ... | %e A374895 | 2 | 6 3 20 15 42 7 72 ... | %e A374895 | 3 | 26 33 44 115 366 91 776 ... | %e A374895 | 4 | 150 15 380 285 4074 70 10440 ... | %e A374895 | 5 | 1082 273 4108 3535 11334 2149 174728 ... | %e A374895 | 6 | 9366 1491 17780 26355 189714 3311 3525192 ... | %e A374895 | 7 | 94586 38001 269348 458555 3706518 285929 11870648 ... | %e A374895 | 8 | 1091670 17295 4663060 1139685 82749954 220430 319735800 ... | %e A374895 | ... | ... ... ... ... ... ... ... ... | %e A374895 +-----+--------------------------------------------------------------+ %o A374895 (PARI) T(n,k) = numerator(polylog(-n, 1/k)); %o A374895 matrix(7,7,n,k,T(n-1, k+1)) \\ _Michel Marcus_, Aug 04 2024 %Y A374895 Cf. A374896 (denominators). %Y A374895 Cf. A000629, A008292, A121376, A276805. %K A374895 nonn,tabl,frac %O A374895 0,3 %A A374895 _Mohammed Yaseen_, Jul 22 2024