A185309 - cp's OEIS frontend

A185309 a(0)=0, a(1)=0; for n>1, a(n) = a(n-1) + (n+1)*a(n-2) + 1.

n	a(n)
0	0
1	0
2	1
3	2
4	8
5	21
6	78
7	247
8	950
9	3421
10	13872
11	54925
12	235262
13	1004213
14	4533144
15	20600553
16	97664002
17	468473957
18	2324089996
19	11693569137
20	60499459054
21	317757980069
22	1709245538312
23	9335437059969
24	52066575517770
25	294787939076965
26	1700585478056756
27	9954647772211777

[0, 0, 1, 2, 8, 21, 78, 247, 950, 3421, 13872, 54925, 235262, 1004213, 4533144, 20600553, 97664002, 468473957, 2324089996, 11693569137, 60499459054, 317757980069, 1709245538312, 9335437059969, 52066575517770, 294787939076965, 1700585478056756, 9954647772211777]

cp's OEIS Frontend

A185309 a(0)=0, a(1)=0; for n>1, a(n) = a(n-1) + (n+1)*a(n-2) + 1.

Table of values

List of values