A374140 - cp's OEIS frontend

A374140 a(n) is the permanent of the symmetric Toeplitz matrix of order n whose element (i,j) equals abs(i-j) or 1 if i = j.

n	a(n)
0	1
1	1
2	2
3	11
4	117
5	2083
6	55482
7	2063149
8	102176977
9	6490667261
10	514651043730
11	49787897503031
12	5771746960693493
13	789652404867861919
14	125885777192807718730
15	23129357587464094132601
16	4851600400570400272371009
17	1152232847579194480216644249
18	307579355879152834353840187554

[1, 1, 2, 11, 117, 2083, 55482, 2063149, 102176977, 6490667261, 514651043730, 49787897503031, 5771746960693493, 789652404867861919, 125885777192807718730, 23129357587464094132601, 4851600400570400272371009, 1152232847579194480216644249, 307579355879152834353840187554]

cp's OEIS Frontend

A374140 a(n) is the permanent of the symmetric Toeplitz matrix of order n whose element (i,j) equals abs(i-j) or 1 if i = j.

Table of values

List of values