A353933 - cp's OEIS frontend

A353933 a(n) is the permanent of the n X n symmetric matrix M(n) whose generic element M[i,j] is equal to the digital root of i*j.

n	a(n)
0	1
1	1
2	8
3	216
4	7344
5	168183
6	7226091
7	295259094
8	11801772252
9	1673511251940
10	65568867621336
11	2710049208604776
12	202103867012027328
13	12881755844526953376
14	736186737257150962752
15	70484099228399057425344
16	5507570249593121504026368
17	434305172863416192470350848
18	122043063804581668929348667392

[1, 1, 8, 216, 7344, 168183, 7226091, 295259094, 11801772252, 1673511251940, 65568867621336, 2710049208604776, 202103867012027328, 12881755844526953376, 736186737257150962752, 70484099228399057425344, 5507570249593121504026368, 434305172863416192470350848, 122043063804581668929348667392]

cp's OEIS Frontend

A353933 a(n) is the permanent of the n X n symmetric matrix M(n) whose generic element M[i,j] is equal to the digital root of i*j.

Table of values

List of values