A380591 - cp's OEIS frontend

A380591 a(n) is the number of dissections of a convex (n+2)-sided polygon by nonintersecting diagonals into triangles and quadrilaterals such that at least one of the dividing diagonals passes through a chosen vertex.

n	a(n)
1	0
2	1
3	5
4	21
5	90
6	395
7	1773
8	8110
9	37686
10	177450
11	844935
12	4061762
13	19687020
14	96107358
15	472132330
16	2332304055
17	11578595554
18	57736664825
19	289055592810
20	1452381167325
21	7321620080550
22	37020073600755
23	187699184460450
24	954084756674088
25	4861008765722340

[0, 1, 5, 21, 90, 395, 1773, 8110, 37686, 177450, 844935, 4061762, 19687020, 96107358, 472132330, 2332304055, 11578595554, 57736664825, 289055592810, 1452381167325, 7321620080550, 37020073600755, 187699184460450, 954084756674088, 4861008765722340]

cp's OEIS Frontend

A380591 a(n) is the number of dissections of a convex (n+2)-sided polygon by nonintersecting diagonals into triangles and quadrilaterals such that at least one of the dividing diagonals passes through a chosen vertex.

Table of values

List of values