A143418 - cp's OEIS frontend

A143418 Triangle read by rows. T(n,k) = binomial(n,k)*(binomial(n,k)-1)/2.

n	a(n)
1	1
2	3
3	3
4	6
5	15
6	6
7	10
8	45
9	45
10	10
11	15
12	105
13	190
14	105
15	15
16	21
17	210
18	595
19	595
20	210
21	21
22	28
23	378
24	1540
25	2415
26	1540
27	378
28	28
29	36
30	630
31	3486
32	7875
33	7875
34	3486
35	630
36	36
37	45
38	990
39	7140
40	21945
41	31626
42	21945
43	7140
44	990
45	45
46	55
47	1485
48	13530
49	54285
50	106491
51	106491

[1, 3, 3, 6, 15, 6, 10, 45, 45, 10, 15, 105, 190, 105, 15, 21, 210, 595, 595, 210, 21, 28, 378, 1540, 2415, 1540, 378, 28, 36, 630, 3486, 7875, 7875, 3486, 630, 36, 45, 990, 7140, 21945, 31626, 21945, 7140, 990, 45, 55, 1485, 13530, 54285, 106491, 106491]

cp's OEIS Frontend

A143418 Triangle read by rows. T(n,k) = binomial(n,k)*(binomial(n,k)-1)/2.

Table of values

List of values