A131086 - cp's OEIS frontend

A131086 Triangle read by rows: T(n,k) = 2*binomial(n,k) - (-1)^(n-k) (0 <= k <= n).

n	a(n)
0	1
1	3
2	1
3	1
4	5
5	1
6	3
7	5
8	7
9	1
10	1
11	9
12	11
13	9
14	1
15	3
16	9
17	21
18	19
19	11
20	1
21	1
22	13
23	29
24	41
25	29
26	13
27	1
28	3
29	13
30	43
31	69
32	71
33	41
34	15
35	1
36	1
37	17
38	55
39	113
40	139
41	113
42	55
43	17
44	1
45	3
46	17
47	73
48	167
49	253
50	251
51	169
52	71
53	19
54	1
55	1
56	21
57	89
58	241
59	419
60	505
61	419
62	241
63	89
64	21
65	1
66	3
67	21
68	111
69	329

[1, 3, 1, 1, 5, 1, 3, 5, 7, 1, 1, 9, 11, 9, 1, 3, 9, 21, 19, 11, 1, 1, 13, 29, 41, 29, 13, 1, 3, 13, 43, 69, 71, 41, 15, 1, 1, 17, 55, 113, 139, 113, 55, 17, 1, 3, 17, 73, 167, 253, 251, 169, 71, 19, 1, 1, 21, 89, 241, 419, 505, 419, 241, 89, 21, 1, 3, 21, 111, 329]

cp's OEIS Frontend

A131086 Triangle read by rows: T(n,k) = 2*binomial(n,k) - (-1)^(n-k) (0 <= k <= n).

Table of values

List of values

n	a(n)
0	1
1	3
2	1
3	1
4	5
5	1
6	3
7	5
8	7
9	1
10	1
11	9
12	11
13	9
14	1
15	3
16	9
17	21
18	19
19	11
20	1
21	1
22	13
23	29
24	41
25	29
26	13
27	1
28	3
29	13
30	43
31	69
32	71
33	41
34	15
35	1
36	1
37	17
38	55
39	113
40	139
41	113
42	55
43	17
44	1
45	3
46	17
47	73
48	167
49	253
50	251
51	169
52	71
53	19
54	1
55	1
56	21
57	89
58	241
59	419
60	505
61	419
62	241
63	89
64	21
65	1
66	3
67	21
68	111
69	329

n	a(n)
0	1
1	3
2	1
3	1
4	5
5	1
6	3
7	5
8	7
9	1
10	1
11	9
12	11
13	9
14	1
15	3
16	9
17	21
18	19
19	11
20	1
21	1
22	13
23	29
24	41
25	29
26	13
27	1
28	3
29	13
30	43
31	69
32	71
33	41
34	15
35	1
36	1
37	17
38	55
39	113
40	139
41	113
42	55
43	17
44	1
45	3
46	17
47	73
48	167
49	253
50	251
51	169
52	71
53	19
54	1
55	1
56	21
57	89
58	241
59	419
60	505
61	419
62	241
63	89
64	21
65	1
66	3
67	21
68	111
69	329

n	a(n)
0	1
1	3
2	1
3	1
4	5
5	1
6	3
7	5
8	7
9	1
10	1
11	9
12	11
13	9
14	1
15	3
16	9
17	21
18	19
19	11
20	1
21	1
22	13
23	29
24	41
25	29
26	13
27	1
28	3
29	13
30	43
31	69
32	71
33	41
34	15
35	1
36	1
37	17
38	55
39	113
40	139
41	113
42	55
43	17
44	1
45	3
46	17
47	73
48	167
49	253
50	251
51	169
52	71
53	19
54	1
55	1
56	21
57	89
58	241
59	419
60	505
61	419
62	241
63	89
64	21
65	1
66	3
67	21
68	111
69	329