A281944 - cp's OEIS frontend

A281944 Triangle read by rows: T(n,k) (n>=1, 3<=k<=n+2) is the number of k-sequences of balls colored with n colors such that exactly two balls are of a color seen previously in the sequence.

n	a(n)
1	1
2	2
3	14
4	3
5	42
6	150
7	4
8	84
9	600
10	1560
11	5
12	140
13	1500
14	7800
15	16800
16	6
17	210
18	3000
19	23400
20	100800
21	191520
22	7
23	294
24	5250
25	54600
26	352800
27	1340640
28	2328480
29	8
30	392
31	8400
32	109200
33	940800
34	5362560
35	18627840
36	30240000
37	9
38	504
39	12600
40	196560
41	2116800
42	16087680
43	83825280
44	272160000
45	419126400
46	10
47	630
48	18000
49	327600
50	4233600
51	40219200
52	279417600
53	1360800000
54	4191264000
55	6187104000

[1, 2, 14, 3, 42, 150, 4, 84, 600, 1560, 5, 140, 1500, 7800, 16800, 6, 210, 3000, 23400, 100800, 191520, 7, 294, 5250, 54600, 352800, 1340640, 2328480, 8, 392, 8400, 109200, 940800, 5362560, 18627840, 30240000, 9, 504, 12600, 196560, 2116800, 16087680, 83825280, 272160000, 419126400, 10, 630, 18000, 327600, 4233600, 40219200, 279417600, 1360800000, 4191264000, 6187104000]

cp's OEIS Frontend

A281944 Triangle read by rows: T(n,k) (n>=1, 3<=k<=n+2) is the number of k-sequences of balls colored with n colors such that exactly two balls are of a color seen previously in the sequence.

Table of values

List of values