A124847 - cp's OEIS frontend

A124847 Triangle read by rows: T(n,k) = k(k+1)*binomial(n-1, k-1)/2 (1 <= k <= n).

n	a(n)
1	1
2	1
3	3
4	1
5	6
6	6
7	1
8	9
9	18
10	10
11	1
12	12
13	36
14	40
15	15
16	1
17	15
18	60
19	100
20	75
21	21
22	1
23	18
24	90
25	200
26	225
27	126
28	28
29	1
30	21
31	126
32	350
33	525
34	441
35	196
36	36
37	1
38	24
39	168
40	560
41	1050
42	1176
43	784
44	288
45	45
46	1
47	27
48	216
49	840
50	1890
51	2646
52	2352
53	1296
54	405
55	55
56	1
57	30
58	270
59	1200
60	3150
61	5292
62	5880

[1, 1, 3, 1, 6, 6, 1, 9, 18, 10, 1, 12, 36, 40, 15, 1, 15, 60, 100, 75, 21, 1, 18, 90, 200, 225, 126, 28, 1, 21, 126, 350, 525, 441, 196, 36, 1, 24, 168, 560, 1050, 1176, 784, 288, 45, 1, 27, 216, 840, 1890, 2646, 2352, 1296, 405, 55, 1, 30, 270, 1200, 3150, 5292, 5880]

cp's OEIS Frontend

A124847 Triangle read by rows: T(n,k) = k(k+1)*binomial(n-1, k-1)/2 (1 <= k <= n).

Table of values

List of values