A007717 - cp's OEIS frontend

A007717 Number of symmetric polynomial functions of degree n of a symmetric matrix (of indefinitely large size) under joint row and column permutations. Also number of multigraphs with n edges (allowing loops) on an infinite set of nodes.

n	a(n)
0	1
1	2
2	7
3	23
4	79
5	274
6	1003
7	3763
8	14723
9	59663
10	250738
11	1090608
12	4905430
13	22777420
14	109040012
15	537401702
16	2723210617
17	14170838544
18	75639280146
19	413692111521
20	2316122210804
21	13261980807830
22	77598959094772
23	463626704130058
24	2826406013488180
25	17569700716557737

[1, 2, 7, 23, 79, 274, 1003, 3763, 14723, 59663, 250738, 1090608, 4905430, 22777420, 109040012, 537401702, 2723210617, 14170838544, 75639280146, 413692111521, 2316122210804, 13261980807830, 77598959094772, 463626704130058, 2826406013488180, 17569700716557737]

cp's OEIS Frontend

A007717 Number of symmetric polynomial functions of degree n of a symmetric matrix (of indefinitely large size) under joint row and column permutations. Also number of multigraphs with n edges (allowing loops) on an infinite set of nodes.

Table of values

List of values