A025238 - cp's OEIS frontend

A025238 a(n) = a(1)a(n-1) + a(2)a(n-2) + ...+ a(n-2)*a(2) for n >= 3.

n	a(n)
1	3
2	1
3	3
4	10
5	36
6	137
7	543
8	2219
9	9285
10	39587
11	171369
12	751236
13	3328218
14	14878455
15	67030785
16	304036170
17	1387247580
18	6363044315
19	29323149825
20	135700543190
21	630375241380
22	2938391049395
23	13739779184085
24	64430797069375
25	302934667061301

[3, 1, 3, 10, 36, 137, 543, 2219, 9285, 39587, 171369, 751236, 3328218, 14878455, 67030785, 304036170, 1387247580, 6363044315, 29323149825, 135700543190, 630375241380, 2938391049395, 13739779184085, 64430797069375, 302934667061301]

cp's OEIS Frontend

A025238 a(n) = a(1)a(n-1) + a(2)a(n-2) + ...+ a(n-2)*a(2) for n >= 3.

Table of values

List of values

cp's OEIS Frontend

A025238 a(n) = a(1)*a(n-1) + a(2)*a(n-2) + ...+ a(n-2)*a(2) for n >= 3.

Table of values

List of values

A025238 a(n) = a(1)a(n-1) + a(2)a(n-2) + ...+ a(n-2)*a(2) for n >= 3.