A336286 - cp's OEIS frontend

A336286 The hafnian of a symmetric Toeplitz matrix of order 2*n, n>=2 with the first row (0,1,2,...,2,0); a(0)=a(1)=1.

n	a(n)
0	1
1	1
2	5
3	57
4	859
5	16087
6	362781
7	9593105
8	291347603
9	9998539791
10	382732896853
11	16169762600329
12	747423640472235
13	37523173542935207
14	2033249827596197549
15	118278700627740322977
16	7352204062275501662371
17	486343759162888783503775
18	34112193002666850227154213

[1, 1, 5, 57, 859, 16087, 362781, 9593105, 291347603, 9998539791, 382732896853, 16169762600329, 747423640472235, 37523173542935207, 2033249827596197549, 118278700627740322977, 7352204062275501662371, 486343759162888783503775, 34112193002666850227154213]

cp's OEIS Frontend

A336286 The hafnian of a symmetric Toeplitz matrix of order 2*n, n>=2 with the first row (0,1,2,...,2,0); a(0)=a(1)=1.

Table of values

List of values