A027023 - cp's OEIS frontend

A027023 Tribonacci array: triangular array T read by rows: T(n,0)=1 for n >= 0, T(n,1) = T(n,2n) = 1 for n >= 1, T(n,2)=1 for n >= 2 and for n >= 3, T(n,k) = T(n-1,k-3) + T(n-1,k-2) + T(n-1,k-1) for 3 <= k <= 2n-1.

n	a(n)
0	1
1	1
2	1
3	1
4	1
5	1
6	1
7	3
8	1
9	1
10	1
11	1
12	3
13	5
14	5
15	1
16	1
17	1
18	1
19	3
20	5
21	9
22	13
23	11
24	1
25	1
26	1
27	1
28	3
29	5
30	9
31	17
32	27
33	33
34	25
35	1
36	1
37	1
38	1
39	3
40	5
41	9
42	17
43	31
44	53
45	77
46	85
47	59
48	1
49	1
50	1
51	1
52	3
53	5
54	9
55	17
56	31
57	57
58	101
59	161
60	215
61	221
62	145
63	1
64	1
65	1
66	1
67	3
68	5
69	9
70	17
71	31
72	57
73	105
74	189
75	319
76	477
77	597
78	581
79	367
80	1

[1, 1, 1, 1, 1, 1, 1, 3, 1, 1, 1, 1, 3, 5, 5, 1, 1, 1, 1, 3, 5, 9, 13, 11, 1, 1, 1, 1, 3, 5, 9, 17, 27, 33, 25, 1, 1, 1, 1, 3, 5, 9, 17, 31, 53, 77, 85, 59, 1, 1, 1, 1, 3, 5, 9, 17, 31, 57, 101, 161, 215, 221, 145, 1, 1, 1, 1, 3, 5, 9, 17, 31, 57, 105, 189, 319, 477, 597, 581, 367, 1]

cp's OEIS Frontend

A027023 Tribonacci array: triangular array T read by rows: T(n,0)=1 for n >= 0, T(n,1) = T(n,2n) = 1 for n >= 1, T(n,2)=1 for n >= 2 and for n >= 3, T(n,k) = T(n-1,k-3) + T(n-1,k-2) + T(n-1,k-1) for 3 <= k <= 2n-1.

Table of values

List of values

n	a(n)
0	1
1	1
2	1
3	1
4	1
5	1
6	1
7	3
8	1
9	1
10	1
11	1
12	3
13	5
14	5
15	1
16	1
17	1
18	1
19	3
20	5
21	9
22	13
23	11
24	1
25	1
26	1
27	1
28	3
29	5
30	9
31	17
32	27
33	33
34	25
35	1
36	1
37	1
38	1
39	3
40	5
41	9
42	17
43	31
44	53
45	77
46	85
47	59
48	1
49	1
50	1
51	1
52	3
53	5
54	9
55	17
56	31
57	57
58	101
59	161
60	215
61	221
62	145
63	1
64	1
65	1
66	1
67	3
68	5
69	9
70	17
71	31
72	57
73	105
74	189
75	319
76	477
77	597
78	581
79	367
80	1

n	a(n)
0	1
1	1
2	1
3	1
4	1
5	1
6	1
7	3
8	1
9	1
10	1
11	1
12	3
13	5
14	5
15	1
16	1
17	1
18	1
19	3
20	5
21	9
22	13
23	11
24	1
25	1
26	1
27	1
28	3
29	5
30	9
31	17
32	27
33	33
34	25
35	1
36	1
37	1
38	1
39	3
40	5
41	9
42	17
43	31
44	53
45	77
46	85
47	59
48	1
49	1
50	1
51	1
52	3
53	5
54	9
55	17
56	31
57	57
58	101
59	161
60	215
61	221
62	145
63	1
64	1
65	1
66	1
67	3
68	5
69	9
70	17
71	31
72	57
73	105
74	189
75	319
76	477
77	597
78	581
79	367
80	1

n	a(n)
0	1
1	1
2	1
3	1
4	1
5	1
6	1
7	3
8	1
9	1
10	1
11	1
12	3
13	5
14	5
15	1
16	1
17	1
18	1
19	3
20	5
21	9
22	13
23	11
24	1
25	1
26	1
27	1
28	3
29	5
30	9
31	17
32	27
33	33
34	25
35	1
36	1
37	1
38	1
39	3
40	5
41	9
42	17
43	31
44	53
45	77
46	85
47	59
48	1
49	1
50	1
51	1
52	3
53	5
54	9
55	17
56	31
57	57
58	101
59	161
60	215
61	221
62	145
63	1
64	1
65	1
66	1
67	3
68	5
69	9
70	17
71	31
72	57
73	105
74	189
75	319
76	477
77	597
78	581
79	367
80	1