A025266 - cp's OEIS frontend

A025266 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	1
3	0
4	1
5	2
6	6
7	16
8	45
9	126
10	358
11	1024
12	2954
13	8580
14	25084
15	73760
16	218045
17	647670
18	1932230
19	5787520
20	17398270
21	52476700
22	158765300
23	481690080
24	1465239250
25	4467799212
26	13653601116
27	41812009216
28	128290240180
29	394338641416
30	1214165174712

[1, 1, 0, 1, 2, 6, 16, 45, 126, 358, 1024, 2954, 8580, 25084, 73760, 218045, 647670, 1932230, 5787520, 17398270, 52476700, 158765300, 481690080, 1465239250, 4467799212, 13653601116, 41812009216, 128290240180, 394338641416, 1214165174712]

cp's OEIS Frontend

A025266 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

A025266 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

A025266 a(n) = a(1)a(n-1) + a(2)a(n-2) + ... + a(n-1)*a(1) for n >= 4.