A025240 - cp's OEIS frontend

A025240 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	2
3	6
4	22
5	90
6	394
7	1806
8	8558
9	41586
10	206098
11	1037718
12	5293446
13	27297738
14	142078746
15	745387038
16	3937603038
17	20927156706
18	111818026018
19	600318853926
20	3236724317174
21	17518619320890
22	95149655201962
23	518431875418926
24	2832923350929742

[3, 2, 6, 22, 90, 394, 1806, 8558, 41586, 206098, 1037718, 5293446, 27297738, 142078746, 745387038, 3937603038, 20927156706, 111818026018, 600318853926, 3236724317174, 17518619320890, 95149655201962, 518431875418926, 2832923350929742]

cp's OEIS Frontend

A025240 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

A025240 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

A025240 a(n) = a(1)a(n-1) + a(2)a(n-2) + ...+ a(n-2)*a(2) for n >= 3.