A336114 - cp's OEIS frontend

A336114 The hafnian of a symmetric Toeplitz matrix of order 2*n, n>=2 with the first row (0,1,2,...,2,1); a(0)=a(1)=1.

n	a(n)
0	1
1	1
2	6
3	64
4	930
5	17088
6	380870
7	9992064
8	301738626
9	10310669440
10	393355695942
11	16573741095360
12	764401360062626
13	38304552622588224
14	2072335759298438790
15	120390122318741003008
16	7474705606285243345410
17	493940966313183768532224
18	34613731176130328980714886

[1, 1, 6, 64, 930, 17088, 380870, 9992064, 301738626, 10310669440, 393355695942, 16573741095360, 764401360062626, 38304552622588224, 2072335759298438790, 120390122318741003008, 7474705606285243345410, 493940966313183768532224, 34613731176130328980714886]

cp's OEIS Frontend

A336114 The hafnian of a symmetric Toeplitz matrix of order 2*n, n>=2 with the first row (0,1,2,...,2,1); a(0)=a(1)=1.

Table of values

List of values