A123603 - cp's OEIS frontend

A123603 Triangle T(n,k), 0<=k<=n, read by rows, with T(0,0) = 1, T(n,k) = 0 if k<0 or if k>n, T(n,k) = T(n-1,k-1) + T(n-1,k) + T(n-2,k-2) - T(n-2,k-1) + T(n-2,k).

n	a(n)
0	1
1	1
2	1
3	2
4	1
5	2
6	3
7	3
8	3
9	3
10	5
11	5
12	9
13	5
14	5
15	8
16	10
17	17
18	17
19	10
20	8
21	13
22	18
23	36
24	35
25	36
26	18
27	13
28	21
29	33
30	69
31	81
32	81
33	69
34	33
35	21
36	34
37	59
38	133
39	167
40	199
41	167
42	133
43	59
44	34
45	55
46	105
47	249
48	345
49	435
50	435
51	345
52	249
53	105
54	55
55	89
56	185
57	462
58	687
59	945
60	1005
61	945
62	687
63	462
64	185
65	89

[1, 1, 1, 2, 1, 2, 3, 3, 3, 3, 5, 5, 9, 5, 5, 8, 10, 17, 17, 10, 8, 13, 18, 36, 35, 36, 18, 13, 21, 33, 69, 81, 81, 69, 33, 21, 34, 59, 133, 167, 199, 167, 133, 59, 34, 55, 105, 249, 345, 435, 435, 345, 249, 105, 55, 89, 185, 462, 687, 945, 1005, 945, 687, 462, 185, 89]

cp's OEIS Frontend

A123603 Triangle T(n,k), 0<=k<=n, read by rows, with T(0,0) = 1, T(n,k) = 0 if k<0 or if k>n, T(n,k) = T(n-1,k-1) + T(n-1,k) + T(n-2,k-2) - T(n-2,k-1) + T(n-2,k).

Table of values

List of values