A128821 - cp's OEIS frontend

A128821 Triangle T(n,k), 1<=k<=n, read by rows defined by :T(n,k)=C(n,k)C(n-1,k-1)+C(n,k-1)C(n-1,k)where C(n,k)=A007318(n,k) .

n	a(n)
1	1
2	3
3	1
4	5
5	9
6	1
7	7
8	30
9	18
10	1
11	9
12	70
13	100
14	30
15	1
16	11
17	135
18	350
19	250
20	45
21	1
22	13
23	231
24	945
25	1225
26	525
27	63
28	1
29	15
30	364
31	2156
32	4410
33	3430
34	980
35	84
36	1
37	17
38	540
39	4368
40	12936
41	15876
42	8232
43	1680
44	108
45	1
46	19
47	765
48	8100
49	32760
50	58212
51	47628
52	17640
53	2700
54	135
55	1

[1, 3, 1, 5, 9, 1, 7, 30, 18, 1, 9, 70, 100, 30, 1, 11, 135, 350, 250, 45, 1, 13, 231, 945, 1225, 525, 63, 1, 15, 364, 2156, 4410, 3430, 980, 84, 1, 17, 540, 4368, 12936, 15876, 8232, 1680, 108, 1, 19, 765, 8100, 32760, 58212, 47628, 17640, 2700, 135, 1]

cp's OEIS Frontend

A128821 Triangle T(n,k), 1<=k<=n, read by rows defined by :T(n,k)=C(n,k)C(n-1,k-1)+C(n,k-1)C(n-1,k)where C(n,k)=A007318(n,k) .

Table of values

List of values

cp's OEIS Frontend

A128821 Triangle T(n,k), 1<=k<=n, read by rows defined by :T(n,k)=C(n,k)*C(n-1,k-1)+C(n,k-1)*C(n-1,k)where C(n,k)=A007318(n,k) .

Table of values

List of values

A128821 Triangle T(n,k), 1<=k<=n, read by rows defined by :T(n,k)=C(n,k)C(n-1,k-1)+C(n,k-1)C(n-1,k)where C(n,k)=A007318(n,k) .