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 A366159 #16 Oct 02 2023 13:44:55 %S A366159 1,1,5,1,13,23,1,29,121,119,1,61,479,1081,719,1,125,1681,6719,10081, %T A366159 5039,1,253,5543,35281,90719,100801,40319,1,509,17641,168839,665281, %U A366159 1239839,1088641,362879,1,1021,54959,763561,4339439,12096001,17539199,12700801,3628799 %N A366159 Triangle read by rows: T(n, k) = Sum_{i=0..k-2} (-1)^(i+2) * (k-i-1)^n * binomial(k,i). %H A366159 Michael De Vlieger, <a href="/A366159/b366159.txt">Table of n, a(n) for n = 2..11176</a> (rows 2..150, flattened) %H A366159 Dmitry N. Kozlov, <a href="https://arxiv.org/abs/2309.17142">Stirling complexes</a>, arXiv:2309.17142 [math.CO], 2023. %e A366159 Triangle begins: %e A366159 1; %e A366159 1, 5; %e A366159 1, 13, 23; %e A366159 1, 29, 121, 119; %e A366159 1, 61, 479, 1081, 719; %e A366159 1, 125, 1681, 6719, 10081, 5039; %e A366159 1, 253, 5543, 35281, 90719, 100801, 40319; %e A366159 1, 509, 17641, 168839, 665281, 1239839, 1088641, 362879; %e A366159 1, 1021, 54959, 763561, 4339439, 12096001, 17539199, 12700801, 3628799; %e A366159 ... %t A366159 Table[Sum[(-1)^(i + 2)*(k - i - 1)^n*Binomial[k, i], {i, 0, k - 2} ], {n, 2, 10}, {k, 2, n}] // Flatten (* _Michael De Vlieger_, Oct 02 2023 *) %o A366159 (PARI) T(n, k) = sum(i=0, k-2, (-1)^(i+2) * (k-i-1)^n * binomial(k,i)); %o A366159 tabl(nn) = for (n=2, nn, for (k=2, n, print1(T(n,k), ", "))); %Y A366159 Cf. A000012 (col 2), A036563 (col 3), A033312 (right border). %Y A366159 Cf. A105060. %K A366159 nonn,tabl %O A366159 2,3 %A A366159 _Michel Marcus_, Oct 02 2023