A165997 - cp's OEIS frontend

A165997 Irregular triangle read by rows: T(0,0) = 1, T(n,k) = T(n,k-1) + T(n-1,k) for n > 0, 0 < k <= f(n), where f(n) = floor((2*n+3)/3), and entries outside triangle are 0.

n	a(n)
0	1
1	1
2	1
3	1
4	1
5	2
6	2
7	1
8	3
9	5
10	1
11	4
12	9
13	9
14	1
15	5
16	14
17	23
18	23
19	1
20	6
21	20
22	43
23	66
24	1
25	7
26	27
27	70
28	136
29	136
30	1
31	8
32	35
33	105
34	241
35	377
36	377
37	1
38	9
39	44
40	149
41	390
42	767
43	1144
44	1
45	10
46	54
47	203
48	593
49	1360
50	2504
51	2504
52	1
53	11
54	65
55	268
56	861
57	2221
58	4725
59	7229
60	7229
61	1
62	12
63	77
64	345
65	1206

[1, 1, 1, 1, 1, 2, 2, 1, 3, 5, 1, 4, 9, 9, 1, 5, 14, 23, 23, 1, 6, 20, 43, 66, 1, 7, 27, 70, 136, 136, 1, 8, 35, 105, 241, 377, 377, 1, 9, 44, 149, 390, 767, 1144, 1, 10, 54, 203, 593, 1360, 2504, 2504, 1, 11, 65, 268, 861, 2221, 4725, 7229, 7229, 1, 12, 77, 345, 1206]

cp's OEIS Frontend

A165997 Irregular triangle read by rows: T(0,0) = 1, T(n,k) = T(n,k-1) + T(n-1,k) for n > 0, 0 < k <= f(n), where f(n) = floor((2*n+3)/3), and entries outside triangle are 0.

Table of values

List of values