A115297 - cp's OEIS frontend

A115297 Treillis triangle: a triangle read by rows showing the coefficients of sum formulas of Treillis numbers (A115298). The k-th row (k>=1) contains a(n,k) for n=1 to (k+1)/2 (odd rows) and for n=1 to k/2 (even rows), where a(n,k) satisfies Sum_{n=1..[(k+1)/2_odd, k/2_even]} a(n,k). The last term of each row (and its only odd number) equals Prime(k+1)-2.

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

[1, 3, 2, 5, 4, 9, 2, 8, 11, 6, 10, 15, 4, 8, 14, 17, 6, 12, 16, 21, 2, 10, 14, 20, 27, 6, 12, 18, 26, 29, 4, 8, 16, 24, 28, 35, 6, 12, 22, 26, 34, 39, 2, 10, 18, 24, 32, 38, 41, 6, 16, 20, 30, 36, 40, 45, 4, 12, 18, 26, 34, 38, 44, 51, 10, 14, 24, 30, 36, 42, 50, 57, 6, 12, 20, 28, 32]

cp's OEIS Frontend

Table of values

List of values

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

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

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