A322178 - cp's OEIS frontend

A322178 The number of permutations of {1,2,...,n,1,2,...,n} with the property that b(1) >= b(2) >= ... >= b(n) (there are b(k) numbers between the two k's for k=1..n).

n	a(n)
0	1
1	1
2	5
3	33
4	329
5	3825
6	57293
7	977581
8	19619645
9	442155529
10	11183272973
11	312134648549
12	9554405887621
13	317670072938621
14	11411690507968361
15	440231352579839965

[1, 1, 5, 33, 329, 3825, 57293, 977581, 19619645, 442155529, 11183272973, 312134648549, 9554405887621, 317670072938621, 11411690507968361, 440231352579839965]

cp's OEIS Frontend

A322178 The number of permutations of {1,2,...,n,1,2,...,n} with the property that b(1) >= b(2) >= ... >= b(n) (there are b(k) numbers between the two k's for k=1..n).

Table of values

List of values