A259872 - cp's OEIS frontend

A259872 a(0)=-1, a(1)=1; a(n) = na(n-1) + (n-2)a(n-2) + Sum_{j=1..n-1} a(j)a(n-j) + 2Sum_{j=0..n-1} a(j)*a(n-1-j).

n	a(n)
0	-1
1	1
2	-1
3	2
4	-1
5	9
6	26
7	201
8	1407
9	11714
10	107983
11	1102433
12	12332994
13	150103585
14	1974901951
15	27935229074
16	422799610943
17	6818164335881
18	116717210194218
19	2113959805887881
20	40388891717569887
21	811833598825134258
22	17126091132964548335
23	378335451153341591041

[-1, 1, -1, 2, -1, 9, 26, 201, 1407, 11714, 107983, 1102433, 12332994, 150103585, 1974901951, 27935229074, 422799610943, 6818164335881, 116717210194218, 2113959805887881, 40388891717569887, 811833598825134258, 17126091132964548335, 378335451153341591041]

cp's OEIS Frontend

A259872 a(0)=-1, a(1)=1; a(n) = na(n-1) + (n-2)a(n-2) + Sum_{j=1..n-1} a(j)a(n-j) + 2Sum_{j=0..n-1} a(j)*a(n-1-j).

Table of values

List of values

cp's OEIS Frontend

A259872 a(0)=-1, a(1)=1; a(n) = n*a(n-1) + (n-2)*a(n-2) + Sum_{j=1..n-1} a(j)*a(n-j) + 2*Sum_{j=0..n-1} a(j)*a(n-1-j).

Table of values

List of values

A259872 a(0)=-1, a(1)=1; a(n) = na(n-1) + (n-2)a(n-2) + Sum_{j=1..n-1} a(j)a(n-j) + 2Sum_{j=0..n-1} a(j)*a(n-1-j).