A131087 - cp's OEIS frontend

A131087 Triangle read by rows: T(n,k) = 2*binomial(n,k) - (1 + (-1)^(n-k))/2 (0 <= k <= n).

n	a(n)
0	1
1	2
2	1
3	1
4	4
5	1
6	2
7	5
8	6
9	1
10	1
11	8
12	11
13	8
14	1
15	2
16	9
17	20
18	19
19	10
20	1
21	1
22	12
23	29
24	40
25	29
26	12
27	1
28	2
29	13
30	42
31	69
32	70
33	41
34	14
35	1
36	1
37	16
38	55
39	112
40	139
41	112
42	55
43	16
44	1
45	2
46	17
47	72
48	167
49	252
50	251
51	168
52	71
53	18
54	1
55	1
56	20
57	89
58	240
59	419
60	504
61	419
62	240
63	89
64	20
65	1
66	2
67	21
68	110
69	329
70	660
71	923
72	924

[1, 2, 1, 1, 4, 1, 2, 5, 6, 1, 1, 8, 11, 8, 1, 2, 9, 20, 19, 10, 1, 1, 12, 29, 40, 29, 12, 1, 2, 13, 42, 69, 70, 41, 14, 1, 1, 16, 55, 112, 139, 112, 55, 16, 1, 2, 17, 72, 167, 252, 251, 168, 71, 18, 1, 1, 20, 89, 240, 419, 504, 419, 240, 89, 20, 1, 2, 21, 110, 329, 660, 923, 924]

cp's OEIS Frontend

A131087 Triangle read by rows: T(n,k) = 2*binomial(n,k) - (1 + (-1)^(n-k))/2 (0 <= k <= n).

Table of values

List of values

n	a(n)
0	1
1	2
2	1
3	1
4	4
5	1
6	2
7	5
8	6
9	1
10	1
11	8
12	11
13	8
14	1
15	2
16	9
17	20
18	19
19	10
20	1
21	1
22	12
23	29
24	40
25	29
26	12
27	1
28	2
29	13
30	42
31	69
32	70
33	41
34	14
35	1
36	1
37	16
38	55
39	112
40	139
41	112
42	55
43	16
44	1
45	2
46	17
47	72
48	167
49	252
50	251
51	168
52	71
53	18
54	1
55	1
56	20
57	89
58	240
59	419
60	504
61	419
62	240
63	89
64	20
65	1
66	2
67	21
68	110
69	329
70	660
71	923
72	924

n	a(n)
0	1
1	2
2	1
3	1
4	4
5	1
6	2
7	5
8	6
9	1
10	1
11	8
12	11
13	8
14	1
15	2
16	9
17	20
18	19
19	10
20	1
21	1
22	12
23	29
24	40
25	29
26	12
27	1
28	2
29	13
30	42
31	69
32	70
33	41
34	14
35	1
36	1
37	16
38	55
39	112
40	139
41	112
42	55
43	16
44	1
45	2
46	17
47	72
48	167
49	252
50	251
51	168
52	71
53	18
54	1
55	1
56	20
57	89
58	240
59	419
60	504
61	419
62	240
63	89
64	20
65	1
66	2
67	21
68	110
69	329
70	660
71	923
72	924

n	a(n)
0	1
1	2
2	1
3	1
4	4
5	1
6	2
7	5
8	6
9	1
10	1
11	8
12	11
13	8
14	1
15	2
16	9
17	20
18	19
19	10
20	1
21	1
22	12
23	29
24	40
25	29
26	12
27	1
28	2
29	13
30	42
31	69
32	70
33	41
34	14
35	1
36	1
37	16
38	55
39	112
40	139
41	112
42	55
43	16
44	1
45	2
46	17
47	72
48	167
49	252
50	251
51	168
52	71
53	18
54	1
55	1
56	20
57	89
58	240
59	419
60	504
61	419
62	240
63	89
64	20
65	1
66	2
67	21
68	110
69	329
70	660
71	923
72	924