A259870 - cp's OEIS frontend

A259870 a(0)=0, a(1)=1; a(n) = na(n-1) + (n-2)a(n-2) - Sum_{j=1..n-1} a(j)*a(n-j).

n	a(n)
0	0
1	1
2	1
3	2
4	5
5	17
6	74
7	401
8	2609
9	19802
10	171437
11	1664585
12	17892938
13	210771761
14	2698597601
15	37301188610
16	553473138677
17	8773014886289
18	147928235322314
19	2643635547262049
20	49909639472912177
21	992516629078846010
22	20736210820909594109
23	454084963076923193321

[0, 1, 1, 2, 5, 17, 74, 401, 2609, 19802, 171437, 1664585, 17892938, 210771761, 2698597601, 37301188610, 553473138677, 8773014886289, 147928235322314, 2643635547262049, 49909639472912177, 992516629078846010, 20736210820909594109, 454084963076923193321]

cp's OEIS Frontend

A259870 a(0)=0, a(1)=1; a(n) = na(n-1) + (n-2)a(n-2) - Sum_{j=1..n-1} a(j)*a(n-j).

Table of values

List of values

cp's OEIS Frontend

A259870 a(0)=0, a(1)=1; a(n) = n*a(n-1) + (n-2)*a(n-2) - Sum_{j=1..n-1} a(j)*a(n-j).

Table of values

List of values

A259870 a(0)=0, a(1)=1; a(n) = na(n-1) + (n-2)a(n-2) - Sum_{j=1..n-1} a(j)*a(n-j).