A135877 - cp's OEIS frontend

A135877 Triangle, read by rows of n(n+1)+1 terms, where row n+1 is generated from row n by inserting zeros at positions [(m+2)^2/4 - 1] for m=1..2n+2 and then taking partial sums from right to left, starting with a single 1 in row 0.

n	a(n)
0	1
1	1
2	1
3	1
4	3
5	3
6	3
7	2
8	2
9	1
10	1
11	15
12	15
13	15
14	12
15	12
16	9
17	9
18	6
19	4
20	4
21	2
22	1
23	1
24	105
25	105
26	105
27	90
28	90
29	75
30	75
31	60
32	48
33	48
34	36
35	27
36	27
37	18
38	12
39	8
40	8
41	4
42	2
43	1
44	1
45	945
46	945
47	945
48	840
49	840
50	735
51	735
52	630
53	540
54	540
55	450
56	375
57	375
58	300
59	240
60	192
61	192
62	144
63	108
64	81
65	81
66	54
67	36
68	24
69	16
70	16
71	8

[1, 1, 1, 1, 3, 3, 3, 2, 2, 1, 1, 15, 15, 15, 12, 12, 9, 9, 6, 4, 4, 2, 1, 1, 105, 105, 105, 90, 90, 75, 75, 60, 48, 48, 36, 27, 27, 18, 12, 8, 8, 4, 2, 1, 1, 945, 945, 945, 840, 840, 735, 735, 630, 540, 540, 450, 375, 375, 300, 240, 192, 192, 144, 108, 81, 81, 54, 36, 24, 16, 16, 8]

cp's OEIS Frontend

A135877 Triangle, read by rows of n(n+1)+1 terms, where row n+1 is generated from row n by inserting zeros at positions [(m+2)^2/4 - 1] for m=1..2n+2 and then taking partial sums from right to left, starting with a single 1 in row 0.

Table of values

List of values

n	a(n)
0	1
1	1
2	1
3	1
4	3
5	3
6	3
7	2
8	2
9	1
10	1
11	15
12	15
13	15
14	12
15	12
16	9
17	9
18	6
19	4
20	4
21	2
22	1
23	1
24	105
25	105
26	105
27	90
28	90
29	75
30	75
31	60
32	48
33	48
34	36
35	27
36	27
37	18
38	12
39	8
40	8
41	4
42	2
43	1
44	1
45	945
46	945
47	945
48	840
49	840
50	735
51	735
52	630
53	540
54	540
55	450
56	375
57	375
58	300
59	240
60	192
61	192
62	144
63	108
64	81
65	81
66	54
67	36
68	24
69	16
70	16
71	8

n	a(n)
0	1
1	1
2	1
3	1
4	3
5	3
6	3
7	2
8	2
9	1
10	1
11	15
12	15
13	15
14	12
15	12
16	9
17	9
18	6
19	4
20	4
21	2
22	1
23	1
24	105
25	105
26	105
27	90
28	90
29	75
30	75
31	60
32	48
33	48
34	36
35	27
36	27
37	18
38	12
39	8
40	8
41	4
42	2
43	1
44	1
45	945
46	945
47	945
48	840
49	840
50	735
51	735
52	630
53	540
54	540
55	450
56	375
57	375
58	300
59	240
60	192
61	192
62	144
63	108
64	81
65	81
66	54
67	36
68	24
69	16
70	16
71	8

n	a(n)
0	1
1	1
2	1
3	1
4	3
5	3
6	3
7	2
8	2
9	1
10	1
11	15
12	15
13	15
14	12
15	12
16	9
17	9
18	6
19	4
20	4
21	2
22	1
23	1
24	105
25	105
26	105
27	90
28	90
29	75
30	75
31	60
32	48
33	48
34	36
35	27
36	27
37	18
38	12
39	8
40	8
41	4
42	2
43	1
44	1
45	945
46	945
47	945
48	840
49	840
50	735
51	735
52	630
53	540
54	540
55	450
56	375
57	375
58	300
59	240
60	192
61	192
62	144
63	108
64	81
65	81
66	54
67	36
68	24
69	16
70	16
71	8