A025177 - cp's OEIS frontend

A025177 Triangular array, read by rows: first differences in n,n direction of trinomial array A027907.

n	a(n)
0	1
1	1
2	0
3	1
4	1
5	1
6	2
7	1
8	1
9	1
10	2
11	4
12	4
13	4
14	2
15	1
16	1
17	3
18	7
19	10
20	12
21	10
22	7
23	3
24	1
25	1
26	4
27	11
28	20
29	29
30	32
31	29
32	20
33	11
34	4
35	1
36	1
37	5
38	16
39	35
40	60
41	81
42	90
43	81
44	60
45	35
46	16
47	5
48	1
49	1
50	6
51	22
52	56
53	111
54	176
55	231
56	252
57	231
58	176
59	111
60	56
61	22
62	6
63	1
64	1
65	7
66	29
67	84
68	189
69	343
70	518
71	659
72	714
73	659
74	518
75	343

[1, 1, 0, 1, 1, 1, 2, 1, 1, 1, 2, 4, 4, 4, 2, 1, 1, 3, 7, 10, 12, 10, 7, 3, 1, 1, 4, 11, 20, 29, 32, 29, 20, 11, 4, 1, 1, 5, 16, 35, 60, 81, 90, 81, 60, 35, 16, 5, 1, 1, 6, 22, 56, 111, 176, 231, 252, 231, 176, 111, 56, 22, 6, 1, 1, 7, 29, 84, 189, 343, 518, 659, 714, 659, 518, 343]

cp's OEIS Frontend

A025177 Triangular array, read by rows: first differences in n,n direction of trinomial array A027907.

Table of values

List of values

n	a(n)
0	1
1	1
2	0
3	1
4	1
5	1
6	2
7	1
8	1
9	1
10	2
11	4
12	4
13	4
14	2
15	1
16	1
17	3
18	7
19	10
20	12
21	10
22	7
23	3
24	1
25	1
26	4
27	11
28	20
29	29
30	32
31	29
32	20
33	11
34	4
35	1
36	1
37	5
38	16
39	35
40	60
41	81
42	90
43	81
44	60
45	35
46	16
47	5
48	1
49	1
50	6
51	22
52	56
53	111
54	176
55	231
56	252
57	231
58	176
59	111
60	56
61	22
62	6
63	1
64	1
65	7
66	29
67	84
68	189
69	343
70	518
71	659
72	714
73	659
74	518
75	343

n	a(n)
0	1
1	1
2	0
3	1
4	1
5	1
6	2
7	1
8	1
9	1
10	2
11	4
12	4
13	4
14	2
15	1
16	1
17	3
18	7
19	10
20	12
21	10
22	7
23	3
24	1
25	1
26	4
27	11
28	20
29	29
30	32
31	29
32	20
33	11
34	4
35	1
36	1
37	5
38	16
39	35
40	60
41	81
42	90
43	81
44	60
45	35
46	16
47	5
48	1
49	1
50	6
51	22
52	56
53	111
54	176
55	231
56	252
57	231
58	176
59	111
60	56
61	22
62	6
63	1
64	1
65	7
66	29
67	84
68	189
69	343
70	518
71	659
72	714
73	659
74	518
75	343

n	a(n)
0	1
1	1
2	0
3	1
4	1
5	1
6	2
7	1
8	1
9	1
10	2
11	4
12	4
13	4
14	2
15	1
16	1
17	3
18	7
19	10
20	12
21	10
22	7
23	3
24	1
25	1
26	4
27	11
28	20
29	29
30	32
31	29
32	20
33	11
34	4
35	1
36	1
37	5
38	16
39	35
40	60
41	81
42	90
43	81
44	60
45	35
46	16
47	5
48	1
49	1
50	6
51	22
52	56
53	111
54	176
55	231
56	252
57	231
58	176
59	111
60	56
61	22
62	6
63	1
64	1
65	7
66	29
67	84
68	189
69	343
70	518
71	659
72	714
73	659
74	518
75	343