A131909 - cp's OEIS frontend

A131909 Triangle, read by rows, where T(n,k) = T(n-1,k-2) + T(n-1,k-1) for n>=k>1, with T(0,0)=1 and T(n,0) = T(n+1,1) = T(n-1,n-1) for n>0.

n	a(n)
0	1
1	1
2	1
3	1
4	1
5	2
6	2
7	1
8	2
9	3
10	3
11	2
12	3
13	3
14	5
15	5
16	3
17	5
18	5
19	6
20	8
21	8
22	5
23	8
24	8
25	10
26	11
27	14
28	14
29	8
30	13
31	13
32	16
33	18
34	21
35	25
36	25
37	14
38	22
39	21
40	26
41	29
42	34
43	39
44	46
45	46
46	25
47	39
48	36
49	43
50	47
51	55
52	63
53	73
54	85
55	85
56	46
57	71
58	64
59	75
60	79
61	90
62	102
63	118
64	136
65	158
66	158
67	85
68	131
69	117
70	135
71	139
72	154
73	169

[1, 1, 1, 1, 1, 2, 2, 1, 2, 3, 3, 2, 3, 3, 5, 5, 3, 5, 5, 6, 8, 8, 5, 8, 8, 10, 11, 14, 14, 8, 13, 13, 16, 18, 21, 25, 25, 14, 22, 21, 26, 29, 34, 39, 46, 46, 25, 39, 36, 43, 47, 55, 63, 73, 85, 85, 46, 71, 64, 75, 79, 90, 102, 118, 136, 158, 158, 85, 131, 117, 135, 139, 154, 169]

cp's OEIS Frontend

A131909 Triangle, read by rows, where T(n,k) = T(n-1,k-2) + T(n-1,k-1) for n>=k>1, with T(0,0)=1 and T(n,0) = T(n+1,1) = T(n-1,n-1) for n>0.

Table of values

List of values

n	a(n)
0	1
1	1
2	1
3	1
4	1
5	2
6	2
7	1
8	2
9	3
10	3
11	2
12	3
13	3
14	5
15	5
16	3
17	5
18	5
19	6
20	8
21	8
22	5
23	8
24	8
25	10
26	11
27	14
28	14
29	8
30	13
31	13
32	16
33	18
34	21
35	25
36	25
37	14
38	22
39	21
40	26
41	29
42	34
43	39
44	46
45	46
46	25
47	39
48	36
49	43
50	47
51	55
52	63
53	73
54	85
55	85
56	46
57	71
58	64
59	75
60	79
61	90
62	102
63	118
64	136
65	158
66	158
67	85
68	131
69	117
70	135
71	139
72	154
73	169

n	a(n)
0	1
1	1
2	1
3	1
4	1
5	2
6	2
7	1
8	2
9	3
10	3
11	2
12	3
13	3
14	5
15	5
16	3
17	5
18	5
19	6
20	8
21	8
22	5
23	8
24	8
25	10
26	11
27	14
28	14
29	8
30	13
31	13
32	16
33	18
34	21
35	25
36	25
37	14
38	22
39	21
40	26
41	29
42	34
43	39
44	46
45	46
46	25
47	39
48	36
49	43
50	47
51	55
52	63
53	73
54	85
55	85
56	46
57	71
58	64
59	75
60	79
61	90
62	102
63	118
64	136
65	158
66	158
67	85
68	131
69	117
70	135
71	139
72	154
73	169

n	a(n)
0	1
1	1
2	1
3	1
4	1
5	2
6	2
7	1
8	2
9	3
10	3
11	2
12	3
13	3
14	5
15	5
16	3
17	5
18	5
19	6
20	8
21	8
22	5
23	8
24	8
25	10
26	11
27	14
28	14
29	8
30	13
31	13
32	16
33	18
34	21
35	25
36	25
37	14
38	22
39	21
40	26
41	29
42	34
43	39
44	46
45	46
46	25
47	39
48	36
49	43
50	47
51	55
52	63
53	73
54	85
55	85
56	46
57	71
58	64
59	75
60	79
61	90
62	102
63	118
64	136
65	158
66	158
67	85
68	131
69	117
70	135
71	139
72	154
73	169