A220700 - cp's OEIS frontend

A220700 a(0)=0, a(1)=0; for n>1, a(n) = a(n-1) + (n+3)*a(n-2) + 1.

n	a(n)
0	0
1	0
2	1
3	2
4	10
5	27
6	118
7	389
8	1688
9	6357
10	28302
11	117301
12	541832
13	2418649
14	11629794
15	55165477
16	276131564
17	1379441105
18	7178203950
19	37525908261
20	202624599112
21	1103246397377
22	6168861375178
23	34853267706981
24	201412524836788
25	1177304020632257
26	7018267240899110

[0, 0, 1, 2, 10, 27, 118, 389, 1688, 6357, 28302, 117301, 541832, 2418649, 11629794, 55165477, 276131564, 1379441105, 7178203950, 37525908261, 202624599112, 1103246397377, 6168861375178, 34853267706981, 201412524836788, 1177304020632257, 7018267240899110]

cp's OEIS Frontend

A220700 a(0)=0, a(1)=0; for n>1, a(n) = a(n-1) + (n+3)*a(n-2) + 1.

Table of values

List of values