A354979 Triangle read by rows. T(n, k) = |Stirling1(k + n, n)|.
1, 1, 1, 1, 3, 11, 1, 6, 35, 225, 1, 10, 85, 735, 6769, 1, 15, 175, 1960, 22449, 269325, 1, 21, 322, 4536, 63273, 902055, 13339535, 1, 28, 546, 9450, 157773, 2637558, 44990231, 790943153, 1, 36, 870, 18150, 357423, 6926634, 135036473, 2681453775, 54631129553
Offset: 0
Examples
[0] 1; [1] 1, 1; [2] 1, 3, 11; [3] 1, 6, 35, 225; [4] 1, 10, 85, 735, 6769; [5] 1, 15, 175, 1960, 22449, 269325; [6] 1, 21, 322, 4536, 63273, 902055, 13339535; [7] 1, 28, 546, 9450, 157773, 2637558, 44990231, 790943153; [8] 1, 36, 870, 18150, 357423, 6926634, 135036473, 2681453775, 54631129553;
Links
- Andrew Francis and Michael Hendriksen, Counting spinal phylogenetic networks, arXiv:2502.14223 [q-bio.PE], 2025. See p. 16.