A323944 Irregular triangle read by rows: Numbers of unbranched k-5-catafusenes.

1, 1, 1, 2, 3, 3, 1, 4, 8, 12, 5, 2, 10, 29, 48, 36, 15, 3, 25, 95, 193, 185, 114, 32, 6, 70, 329, 757, 933, 706, 316, 80, 10, 196, 1094, 2896, 4239, 3960, 2304, 866, 176, 20, 574, 3659, 10834, 18468, 20313, 14787, 7184, 2238, 408, 36, 1681, 12029, 39697, 76788, 97740, 84672, 51060, 20929, 5688, 896, 72

Offset

2,4

Links

Table of n, a(n) for n=2..64.

Example

Triangle begins:
1, 1, 1,
2, 3, 3, 1,
4, 8, 12, 5, 2,
10, 29, 48, 36, 15, 3,
25, 95, 193, 185, 114, 32, 6,
70, 329, 757, 933, 706, 316, 80, 10,
196, 1094, 2896, 4239, 3960, 2304, 866, 176, 20,
574, 3659, 10834, 18468, 20313, 14787, 7184, 2238, 408, 36,
1681, 12029, 39697, 76788, 97740, 84672, 51060, 20929, 5688, 896, 72,
...

Crossrefs

First column is A001998.

Sequence in context: A089283 A288531 A323942 * A077941 A077990 A085667

Adjacent sequences: A323941 A323942 A323943 * A323945 A323946 A323947

Keyword

nonn,tabf

Author

N. J. A. Sloane, Feb 09 2019

Status

approved