A247492 - cp's OEIS frontend

A247492 Triangle read by rows: T(n, k) = binomial(k-1, n-k)*(n+1)/(n+1-k), 0 <= k <= n.

n	a(n)
0	1
1	-1
2	2
3	1
4	0
5	3
6	-1
7	0
8	2
9	4
10	1
11	0
12	0
13	5
14	5
15	-1
16	0
17	0
18	2
19	9
20	6
21	1
22	0
23	0
24	0
25	7
26	14
27	7
28	-1
29	0
30	0
31	0
32	2
33	16
34	20
35	8
36	1
37	0
38	0
39	0
40	0
41	9
42	30
43	27
44	9
45	-1
46	0
47	0
48	0
49	0
50	2
51	25
52	50
53	35
54	10
55	1
56	0
57	0
58	0
59	0
60	0
61	11
62	55
63	77
64	44
65	11
66	-1
67	0
68	0
69	0
70	0
71	0
72	2
73	36
74	105
75	112
76	54
77	12

[1, -1, 2, 1, 0, 3, -1, 0, 2, 4, 1, 0, 0, 5, 5, -1, 0, 0, 2, 9, 6, 1, 0, 0, 0, 7, 14, 7, -1, 0, 0, 0, 2, 16, 20, 8, 1, 0, 0, 0, 0, 9, 30, 27, 9, -1, 0, 0, 0, 0, 2, 25, 50, 35, 10, 1, 0, 0, 0, 0, 0, 11, 55, 77, 44, 11, -1, 0, 0, 0, 0, 0, 2, 36, 105, 112, 54, 12]

cp's OEIS Frontend

A247492 Triangle read by rows: T(n, k) = binomial(k-1, n-k)*(n+1)/(n+1-k), 0 <= k <= n.

Table of values

List of values

n	a(n)
0	1
1	-1
2	2
3	1
4	0
5	3
6	-1
7	0
8	2
9	4
10	1
11	0
12	0
13	5
14	5
15	-1
16	0
17	0
18	2
19	9
20	6
21	1
22	0
23	0
24	0
25	7
26	14
27	7
28	-1
29	0
30	0
31	0
32	2
33	16
34	20
35	8
36	1
37	0
38	0
39	0
40	0
41	9
42	30
43	27
44	9
45	-1
46	0
47	0
48	0
49	0
50	2
51	25
52	50
53	35
54	10
55	1
56	0
57	0
58	0
59	0
60	0
61	11
62	55
63	77
64	44
65	11
66	-1
67	0
68	0
69	0
70	0
71	0
72	2
73	36
74	105
75	112
76	54
77	12

n	a(n)
0	1
1	-1
2	2
3	1
4	0
5	3
6	-1
7	0
8	2
9	4
10	1
11	0
12	0
13	5
14	5
15	-1
16	0
17	0
18	2
19	9
20	6
21	1
22	0
23	0
24	0
25	7
26	14
27	7
28	-1
29	0
30	0
31	0
32	2
33	16
34	20
35	8
36	1
37	0
38	0
39	0
40	0
41	9
42	30
43	27
44	9
45	-1
46	0
47	0
48	0
49	0
50	2
51	25
52	50
53	35
54	10
55	1
56	0
57	0
58	0
59	0
60	0
61	11
62	55
63	77
64	44
65	11
66	-1
67	0
68	0
69	0
70	0
71	0
72	2
73	36
74	105
75	112
76	54
77	12

n	a(n)
0	1
1	-1
2	2
3	1
4	0
5	3
6	-1
7	0
8	2
9	4
10	1
11	0
12	0
13	5
14	5
15	-1
16	0
17	0
18	2
19	9
20	6
21	1
22	0
23	0
24	0
25	7
26	14
27	7
28	-1
29	0
30	0
31	0
32	2
33	16
34	20
35	8
36	1
37	0
38	0
39	0
40	0
41	9
42	30
43	27
44	9
45	-1
46	0
47	0
48	0
49	0
50	2
51	25
52	50
53	35
54	10
55	1
56	0
57	0
58	0
59	0
60	0
61	11
62	55
63	77
64	44
65	11
66	-1
67	0
68	0
69	0
70	0
71	0
72	2
73	36
74	105
75	112
76	54
77	12