A332773 - cp's OEIS frontend

A332773 The number of permutations of {1,1,1,1,1,2,2,2,2,2,...,n,n,n,n,n} with the property that b(1) >= b(2) >= ... >= b(n), where five k's are skipped by b(k) for k=1..n.

n	a(n)
0	1
1	1
2	4
3	16
4	104
5	508
6	5136
7	28224
8	333360
9	2793888
10	34010208
11	276522240
12	5903380896
13	50068045536
14	892740867024
15	13555604385504
16	260760485969664
17	3084227796562768
18	91112167715233008
19	1145087508241888160

[1, 1, 4, 16, 104, 508, 5136, 28224, 333360, 2793888, 34010208, 276522240, 5903380896, 50068045536, 892740867024, 13555604385504, 260760485969664, 3084227796562768, 91112167715233008, 1145087508241888160]

cp's OEIS Frontend

A332773 The number of permutations of {1,1,1,1,1,2,2,2,2,2,...,n,n,n,n,n} with the property that b(1) >= b(2) >= ... >= b(n), where five k's are skipped by b(k) for k=1..n.

Table of values

List of values