A386974 - cp's OEIS frontend

A386974 a(n) is the permanent of the symmetric n X n matrix M_n where M_n(j,k) = n for j = k, M_n(j,n) = n-j, M_n(n,k) = n-k, M_n(j,k) = 0 otherwise.

n	a(n)
0	1
1	1
2	5
3	42
4	480
5	6875
6	117936
7	2352980
8	53477376
9	1363146165
10	38500000000
11	1193121531646
12	40246286745600
13	1467779362716303
14	57544321060925440
15	2413281884765625000
16	107798160680740192256
17	5109425146945021190505
18	256115971082717276995584
19	13536555538728461399269330

[1, 1, 5, 42, 480, 6875, 117936, 2352980, 53477376, 1363146165, 38500000000, 1193121531646, 40246286745600, 1467779362716303, 57544321060925440, 2413281884765625000, 107798160680740192256, 5109425146945021190505, 256115971082717276995584, 13536555538728461399269330]

cp's OEIS Frontend

A386974 a(n) is the permanent of the symmetric n X n matrix M_n where M_n(j,k) = n for j = k, M_n(j,n) = n-j, M_n(n,k) = n-k, M_n(j,k) = 0 otherwise.

Table of values

List of values