A138775 - cp's OEIS frontend

A138775 Triangle read by rows: T(n,k)=binomial(n-2k,3k) (n>=0, 0<=k<=n/5).

n	a(n)
0	1
1	1
2	1
3	1
4	1
5	1
6	1
7	1
8	4
9	1
10	10
11	1
12	20
13	1
14	35
15	1
16	56
17	1
18	1
19	84
20	7
21	1
22	120
23	28
24	1
25	165
26	84
27	1
28	220
29	210
30	1
31	286
32	462
33	1
34	1
35	364
36	924
37	10
38	1
39	455
40	1716
41	55
42	1
43	560
44	3003
45	220
46	1
47	680
48	5005
49	715
50	1
51	816
52	8008
53	2002
54	1

[1, 1, 1, 1, 1, 1, 1, 1, 4, 1, 10, 1, 20, 1, 35, 1, 56, 1, 1, 84, 7, 1, 120, 28, 1, 165, 84, 1, 220, 210, 1, 286, 462, 1, 1, 364, 924, 10, 1, 455, 1716, 55, 1, 560, 3003, 220, 1, 680, 5005, 715, 1, 816, 8008, 2002, 1]

cp's OEIS Frontend

A138775 Triangle read by rows: T(n,k)=binomial(n-2k,3k) (n>=0, 0<=k<=n/5).

Table of values

List of values