A120650 Triangle read by rows: numbers of isomers of unbranched a-4-catapolynonagons.
1, 1, 1, 1, 1, 1, 3, 4, 4, 1, 12, 21, 19, 4, 1, 63, 138, 123, 40, 7, 1, 342, 864, 834, 330, 73, 7, 1, 1998, 5526, 5796, 2814, 747, 112, 10, 1, 11772, 34992, 40014, 22464, 7218, 1359, 163, 10, 1, 70308, 221724, 274590, 174798, 65583, 15372, 2307, 220, 13, 1, 420552, 1399680, 1867320, 1321920, 567540, 157284, 29100, 3540, 289, 13, 1
Offset: 0
Examples
Triangle begins 1 1 1 1 1 1 3 4 4 1 12 21 19 4 1 63 138 123 40 7 1 342 864 834 330 73 7 1
References
- J. Brunvoll, S. J. Cyvin and B. N. Cyvin, Isomer enumeration of polygonal systems..., J. Molec. Struct. (Theochem), 364 (1996), 1-13.