A375220 - cp's OEIS frontend

A375220 T(n,k) is the number of permutations of the multiset {1, 1, 2, 2, ..., n, n} with k occurrences of fixed pairs (j,j), where T(n,k), n >= 2, 0 <= k <= n-2 is a triangle read by rows.

n	a(n)
2	5
3	74
4	15
5	2193
6	296
7	30
8	101644
9	10965
10	740
11	50
12	6840085
13	609864
14	32895
15	1480
16	75
17	630985830
18	47880595
19	2134524
20	76755
21	2590
22	105
23	76484389121
24	5047886640
25	191522380
26	5692064
27	153510
28	4144
29	140
30	11792973495032
31	688359502089
32	22715489880
33	574567140
34	12807144
35	276318
36	6216
37	180

[5, 74, 15, 2193, 296, 30, 101644, 10965, 740, 50, 6840085, 609864, 32895, 1480, 75, 630985830, 47880595, 2134524, 76755, 2590, 105, 76484389121, 5047886640, 191522380, 5692064, 153510, 4144, 140, 11792973495032, 688359502089, 22715489880, 574567140, 12807144, 276318, 6216, 180]

cp's OEIS Frontend

A375220 T(n,k) is the number of permutations of the multiset {1, 1, 2, 2, ..., n, n} with k occurrences of fixed pairs (j,j), where T(n,k), n >= 2, 0 <= k <= n-2 is a triangle read by rows.

Table of values

List of values