A025271 - cp's OEIS frontend

A025271 a(n) = a(1)a(n-1) + a(2)a(n-2) + ...+ a(n-1)*a(1) for n >= 5, with initial values 1,1,2,1.

n	a(n)
1	1
2	1
3	2
4	1
5	6
6	18
7	52
8	165
9	518
10	1646
11	5308
12	17258
13	56604
14	187108
15	622632
16	2084461
17	7016134
18	23730006
19	80610156
20	274911614
21	940915892
22	3230919164
23	11127525464
24	38429281122
25	133052559772
26	461740643276
27	1605877668824
28	5596283069300

[1, 1, 2, 1, 6, 18, 52, 165, 518, 1646, 5308, 17258, 56604, 187108, 622632, 2084461, 7016134, 23730006, 80610156, 274911614, 940915892, 3230919164, 11127525464, 38429281122, 133052559772, 461740643276, 1605877668824, 5596283069300]

cp's OEIS Frontend

A025271 a(n) = a(1)a(n-1) + a(2)a(n-2) + ...+ a(n-1)*a(1) for n >= 5, with initial values 1,1,2,1.

Table of values

List of values

cp's OEIS Frontend

A025271 a(n) = a(1)*a(n-1) + a(2)*a(n-2) + ...+ a(n-1)*a(1) for n >= 5, with initial values 1,1,2,1.

Table of values

List of values

A025271 a(n) = a(1)a(n-1) + a(2)a(n-2) + ...+ a(n-1)*a(1) for n >= 5, with initial values 1,1,2,1.