A354738 - cp's OEIS frontend

A354738 a(0) = a(1) = 1; a(n) = (n-1) * Sum_{k=0..n-2} a(k) * a(n-k-2).

n	a(n)
0	1
1	1
2	1
3	4
4	9
5	40
6	135
7	636
8	2688
9	13552
10	65871
11	355520
12	1906740
13	10963656
14	63468171
15	386532944
16	2383820820
17	15294890848
18	99626199832
19	670333562352
20	4583302104450
21	32213942456000
22	230118463761795
23	1683896120829384
24	12520330728001670
25	95110075114630416

[1, 1, 1, 4, 9, 40, 135, 636, 2688, 13552, 65871, 355520, 1906740, 10963656, 63468171, 386532944, 2383820820, 15294890848, 99626199832, 670333562352, 4583302104450, 32213942456000, 230118463761795, 1683896120829384, 12520330728001670, 95110075114630416]

cp's OEIS Frontend

A354738 a(0) = a(1) = 1; a(n) = (n-1) * Sum_{k=0..n-2} a(k) * a(n-k-2).

Table of values

List of values