A025228 - cp's OEIS frontend

A025228 a(n) = a(1)a(n-1) + a(2)a(n-2) + ...+ a(n-1)*a(1) for n >= 3, with initial terms 2,1.

n	a(n)
1	2
2	1
3	4
4	17
5	76
6	354
7	1704
8	8421
9	42508
10	218318
11	1137400
12	5996938
13	31940792
14	171605956
15	928931280
16	5061593709
17	27739833228
18	152809506582
19	845646470616
20	4699126915422
21	26209721959656
22	146681521121244
23	823429928805936
24	4635568494271458

[2, 1, 4, 17, 76, 354, 1704, 8421, 42508, 218318, 1137400, 5996938, 31940792, 171605956, 928931280, 5061593709, 27739833228, 152809506582, 845646470616, 4699126915422, 26209721959656, 146681521121244, 823429928805936, 4635568494271458]

cp's OEIS Frontend

A025228 a(n) = a(1)a(n-1) + a(2)a(n-2) + ...+ a(n-1)*a(1) for n >= 3, with initial terms 2,1.

Table of values

List of values

cp's OEIS Frontend

A025228 a(n) = a(1)*a(n-1) + a(2)*a(n-2) + ...+ a(n-1)*a(1) for n >= 3, with initial terms 2,1.

Table of values

List of values

A025228 a(n) = a(1)a(n-1) + a(2)a(n-2) + ...+ a(n-1)*a(1) for n >= 3, with initial terms 2,1.