A122050 - cp's OEIS frontend

A122050 a(n) = (n-1)*a(n-1) - a(n-4) with a(0)=0, a(1)=1, a(2)=2, a(3)=1.

n	a(n)
0	0
1	1
2	2
3	1
4	3
5	11
6	53
7	317
8	2216
9	17717
10	159400
11	1593683
12	17528297
13	210321847
14	2734024611
15	38274750871
16	574103734768
17	9185449434441
18	156149906360886
19	2810660039745077
20	53401966651421695
21	1068030147578999459
22	22428476949252627753
23	493423682223518065489

[0, 1, 2, 1, 3, 11, 53, 317, 2216, 17717, 159400, 1593683, 17528297, 210321847, 2734024611, 38274750871, 574103734768, 9185449434441, 156149906360886, 2810660039745077, 53401966651421695, 1068030147578999459, 22428476949252627753, 493423682223518065489]

cp's OEIS Frontend

A122050 a(n) = (n-1)*a(n-1) - a(n-4) with a(0)=0, a(1)=1, a(2)=2, a(3)=1.

Table of values

List of values