A109128 - cp's OEIS frontend

A109128 Triangle read by rows: T(n,k) = T(n-1,k-1) + T(n-1,k) + 1 for 0 T(n,0) = T(n,n) = 1.

n	a(n)
0	1
1	1
2	1
3	1
4	3
5	1
6	1
7	5
8	5
9	1
10	1
11	7
12	11
13	7
14	1
15	1
16	9
17	19
18	19
19	9
20	1
21	1
22	11
23	29
24	39
25	29
26	11
27	1
28	1
29	13
30	41
31	69
32	69
33	41
34	13
35	1
36	1
37	15
38	55
39	111
40	139
41	111
42	55
43	15
44	1
45	1
46	17
47	71
48	167
49	251
50	251
51	167
52	71
53	17
54	1
55	1
56	19
57	89
58	239
59	419
60	503
61	419
62	239
63	89
64	19
65	1
66	1
67	21
68	109
69	329
70	659
71	923
72	923
73	659
74	329
75	109
76	21
77	1

[1, 1, 1, 1, 3, 1, 1, 5, 5, 1, 1, 7, 11, 7, 1, 1, 9, 19, 19, 9, 1, 1, 11, 29, 39, 29, 11, 1, 1, 13, 41, 69, 69, 41, 13, 1, 1, 15, 55, 111, 139, 111, 55, 15, 1, 1, 17, 71, 167, 251, 251, 167, 71, 17, 1, 1, 19, 89, 239, 419, 503, 419, 239, 89, 19, 1, 1, 21, 109, 329, 659, 923, 923, 659, 329, 109, 21, 1]

cp's OEIS Frontend

A109128 Triangle read by rows: T(n,k) = T(n-1,k-1) + T(n-1,k) + 1 for 0 T(n,0) = T(n,n) = 1.

Table of values

List of values

n	a(n)
0	1
1	1
2	1
3	1
4	3
5	1
6	1
7	5
8	5
9	1
10	1
11	7
12	11
13	7
14	1
15	1
16	9
17	19
18	19
19	9
20	1
21	1
22	11
23	29
24	39
25	29
26	11
27	1
28	1
29	13
30	41
31	69
32	69
33	41
34	13
35	1
36	1
37	15
38	55
39	111
40	139
41	111
42	55
43	15
44	1
45	1
46	17
47	71
48	167
49	251
50	251
51	167
52	71
53	17
54	1
55	1
56	19
57	89
58	239
59	419
60	503
61	419
62	239
63	89
64	19
65	1
66	1
67	21
68	109
69	329
70	659
71	923
72	923
73	659
74	329
75	109
76	21
77	1

n	a(n)
0	1
1	1
2	1
3	1
4	3
5	1
6	1
7	5
8	5
9	1
10	1
11	7
12	11
13	7
14	1
15	1
16	9
17	19
18	19
19	9
20	1
21	1
22	11
23	29
24	39
25	29
26	11
27	1
28	1
29	13
30	41
31	69
32	69
33	41
34	13
35	1
36	1
37	15
38	55
39	111
40	139
41	111
42	55
43	15
44	1
45	1
46	17
47	71
48	167
49	251
50	251
51	167
52	71
53	17
54	1
55	1
56	19
57	89
58	239
59	419
60	503
61	419
62	239
63	89
64	19
65	1
66	1
67	21
68	109
69	329
70	659
71	923
72	923
73	659
74	329
75	109
76	21
77	1

n	a(n)
0	1
1	1
2	1
3	1
4	3
5	1
6	1
7	5
8	5
9	1
10	1
11	7
12	11
13	7
14	1
15	1
16	9
17	19
18	19
19	9
20	1
21	1
22	11
23	29
24	39
25	29
26	11
27	1
28	1
29	13
30	41
31	69
32	69
33	41
34	13
35	1
36	1
37	15
38	55
39	111
40	139
41	111
42	55
43	15
44	1
45	1
46	17
47	71
48	167
49	251
50	251
51	167
52	71
53	17
54	1
55	1
56	19
57	89
58	239
59	419
60	503
61	419
62	239
63	89
64	19
65	1
66	1
67	21
68	109
69	329
70	659
71	923
72	923
73	659
74	329
75	109
76	21
77	1