A025265 - cp's OEIS frontend

A025265 a(n) = a(1)a(n-1) + a(2)a(n-2) + ... + a(n-1)*a(1) for n >= 4.

n	a(n)
1	1
2	0
3	1
4	2
5	4
6	9
7	22
8	56
9	146
10	388
11	1048
12	2869
13	7942
14	22192
15	62510
16	177308
17	506008
18	1451866
19	4185788
20	12119696
21	35227748
22	102753800
23	300672368
24	882373261
25	2596389190
26	7658677856
27	22642421206
28	67081765932
29	199128719896
30	592179010350
31	1764044315540

[1, 0, 1, 2, 4, 9, 22, 56, 146, 388, 1048, 2869, 7942, 22192, 62510, 177308, 506008, 1451866, 4185788, 12119696, 35227748, 102753800, 300672368, 882373261, 2596389190, 7658677856, 22642421206, 67081765932, 199128719896, 592179010350, 1764044315540]

cp's OEIS Frontend

A025265 a(n) = a(1)a(n-1) + a(2)a(n-2) + ... + a(n-1)*a(1) for n >= 4.

Table of values

List of values

cp's OEIS Frontend

A025265 a(n) = a(1)*a(n-1) + a(2)*a(n-2) + ... + a(n-1)*a(1) for n >= 4.

Table of values

List of values

A025265 a(n) = a(1)a(n-1) + a(2)a(n-2) + ... + a(n-1)*a(1) for n >= 4.