A072405 - cp's OEIS frontend

A072405 Triangle T(n, k) = C(n,k) - C(n-2,k-1) for n >= 3 and T(n, k) = 1 otherwise, read by rows.

n	a(n)
0	1
1	1
2	1
3	1
4	1
5	1
6	1
7	2
8	2
9	1
10	1
11	3
12	4
13	3
14	1
15	1
16	4
17	7
18	7
19	4
20	1
21	1
22	5
23	11
24	14
25	11
26	5
27	1
28	1
29	6
30	16
31	25
32	25
33	16
34	6
35	1
36	1
37	7
38	22
39	41
40	50
41	41
42	22
43	7
44	1
45	1
46	8
47	29
48	63
49	91
50	91
51	63
52	29
53	8
54	1
55	1
56	9
57	37
58	92
59	154
60	182
61	154
62	92
63	37
64	9
65	1
66	1
67	10
68	46
69	129
70	246
71	336
72	336
73	246
74	129
75	46
76	10
77	1
78	1
79	11
80	56
81	175
82	375
83	582
84	672
85	582
86	375
87	175
88	56
89	11
90	1

[1, 1, 1, 1, 1, 1, 1, 2, 2, 1, 1, 3, 4, 3, 1, 1, 4, 7, 7, 4, 1, 1, 5, 11, 14, 11, 5, 1, 1, 6, 16, 25, 25, 16, 6, 1, 1, 7, 22, 41, 50, 41, 22, 7, 1, 1, 8, 29, 63, 91, 91, 63, 29, 8, 1, 1, 9, 37, 92, 154, 182, 154, 92, 37, 9, 1, 1, 10, 46, 129, 246, 336, 336, 246, 129, 46, 10, 1, 1, 11, 56, 175, 375, 582, 672, 582, 375, 175, 56, 11, 1]

cp's OEIS Frontend

A072405 Triangle T(n, k) = C(n,k) - C(n-2,k-1) for n >= 3 and T(n, k) = 1 otherwise, read by rows.

Table of values

List of values

n	a(n)
0	1
1	1
2	1
3	1
4	1
5	1
6	1
7	2
8	2
9	1
10	1
11	3
12	4
13	3
14	1
15	1
16	4
17	7
18	7
19	4
20	1
21	1
22	5
23	11
24	14
25	11
26	5
27	1
28	1
29	6
30	16
31	25
32	25
33	16
34	6
35	1
36	1
37	7
38	22
39	41
40	50
41	41
42	22
43	7
44	1
45	1
46	8
47	29
48	63
49	91
50	91
51	63
52	29
53	8
54	1
55	1
56	9
57	37
58	92
59	154
60	182
61	154
62	92
63	37
64	9
65	1
66	1
67	10
68	46
69	129
70	246
71	336
72	336
73	246
74	129
75	46
76	10
77	1
78	1
79	11
80	56
81	175
82	375
83	582
84	672
85	582
86	375
87	175
88	56
89	11
90	1

n	a(n)
0	1
1	1
2	1
3	1
4	1
5	1
6	1
7	2
8	2
9	1
10	1
11	3
12	4
13	3
14	1
15	1
16	4
17	7
18	7
19	4
20	1
21	1
22	5
23	11
24	14
25	11
26	5
27	1
28	1
29	6
30	16
31	25
32	25
33	16
34	6
35	1
36	1
37	7
38	22
39	41
40	50
41	41
42	22
43	7
44	1
45	1
46	8
47	29
48	63
49	91
50	91
51	63
52	29
53	8
54	1
55	1
56	9
57	37
58	92
59	154
60	182
61	154
62	92
63	37
64	9
65	1
66	1
67	10
68	46
69	129
70	246
71	336
72	336
73	246
74	129
75	46
76	10
77	1
78	1
79	11
80	56
81	175
82	375
83	582
84	672
85	582
86	375
87	175
88	56
89	11
90	1

n	a(n)
0	1
1	1
2	1
3	1
4	1
5	1
6	1
7	2
8	2
9	1
10	1
11	3
12	4
13	3
14	1
15	1
16	4
17	7
18	7
19	4
20	1
21	1
22	5
23	11
24	14
25	11
26	5
27	1
28	1
29	6
30	16
31	25
32	25
33	16
34	6
35	1
36	1
37	7
38	22
39	41
40	50
41	41
42	22
43	7
44	1
45	1
46	8
47	29
48	63
49	91
50	91
51	63
52	29
53	8
54	1
55	1
56	9
57	37
58	92
59	154
60	182
61	154
62	92
63	37
64	9
65	1
66	1
67	10
68	46
69	129
70	246
71	336
72	336
73	246
74	129
75	46
76	10
77	1
78	1
79	11
80	56
81	175
82	375
83	582
84	672
85	582
86	375
87	175
88	56
89	11
90	1