A013580 - cp's OEIS frontend

A013580 Triangle formed in same way as Pascal's triangle (A007318) except 1 is added to central element in even-numbered rows.

n	a(n)
0	1
1	1
2	1
3	1
4	3
5	1
6	1
7	4
8	4
9	1
10	1
11	5
12	9
13	5
14	1
15	1
16	6
17	14
18	14
19	6
20	1
21	1
22	7
23	20
24	29
25	20
26	7
27	1
28	1
29	8
30	27
31	49
32	49
33	27
34	8
35	1
36	1
37	9
38	35
39	76
40	99
41	76
42	35
43	9
44	1
45	1
46	10
47	44
48	111
49	175
50	175
51	111
52	44
53	10
54	1
55	1
56	11
57	54
58	155
59	286
60	351
61	286
62	155
63	54
64	11
65	1
66	1
67	12
68	65
69	209
70	441
71	637
72	637
73	441
74	209
75	65

[1, 1, 1, 1, 3, 1, 1, 4, 4, 1, 1, 5, 9, 5, 1, 1, 6, 14, 14, 6, 1, 1, 7, 20, 29, 20, 7, 1, 1, 8, 27, 49, 49, 27, 8, 1, 1, 9, 35, 76, 99, 76, 35, 9, 1, 1, 10, 44, 111, 175, 175, 111, 44, 10, 1, 1, 11, 54, 155, 286, 351, 286, 155, 54, 11, 1, 1, 12, 65, 209, 441, 637, 637, 441, 209, 65]

cp's OEIS Frontend

A013580 Triangle formed in same way as Pascal's triangle (A007318) except 1 is added to central element in even-numbered rows.

Table of values

List of values

n	a(n)
0	1
1	1
2	1
3	1
4	3
5	1
6	1
7	4
8	4
9	1
10	1
11	5
12	9
13	5
14	1
15	1
16	6
17	14
18	14
19	6
20	1
21	1
22	7
23	20
24	29
25	20
26	7
27	1
28	1
29	8
30	27
31	49
32	49
33	27
34	8
35	1
36	1
37	9
38	35
39	76
40	99
41	76
42	35
43	9
44	1
45	1
46	10
47	44
48	111
49	175
50	175
51	111
52	44
53	10
54	1
55	1
56	11
57	54
58	155
59	286
60	351
61	286
62	155
63	54
64	11
65	1
66	1
67	12
68	65
69	209
70	441
71	637
72	637
73	441
74	209
75	65

n	a(n)
0	1
1	1
2	1
3	1
4	3
5	1
6	1
7	4
8	4
9	1
10	1
11	5
12	9
13	5
14	1
15	1
16	6
17	14
18	14
19	6
20	1
21	1
22	7
23	20
24	29
25	20
26	7
27	1
28	1
29	8
30	27
31	49
32	49
33	27
34	8
35	1
36	1
37	9
38	35
39	76
40	99
41	76
42	35
43	9
44	1
45	1
46	10
47	44
48	111
49	175
50	175
51	111
52	44
53	10
54	1
55	1
56	11
57	54
58	155
59	286
60	351
61	286
62	155
63	54
64	11
65	1
66	1
67	12
68	65
69	209
70	441
71	637
72	637
73	441
74	209
75	65

n	a(n)
0	1
1	1
2	1
3	1
4	3
5	1
6	1
7	4
8	4
9	1
10	1
11	5
12	9
13	5
14	1
15	1
16	6
17	14
18	14
19	6
20	1
21	1
22	7
23	20
24	29
25	20
26	7
27	1
28	1
29	8
30	27
31	49
32	49
33	27
34	8
35	1
36	1
37	9
38	35
39	76
40	99
41	76
42	35
43	9
44	1
45	1
46	10
47	44
48	111
49	175
50	175
51	111
52	44
53	10
54	1
55	1
56	11
57	54
58	155
59	286
60	351
61	286
62	155
63	54
64	11
65	1
66	1
67	12
68	65
69	209
70	441
71	637
72	637
73	441
74	209
75	65