A181307 - cp's OEIS frontend

A181307 Triangle read by rows: T(n,k) is the number of 2-compositions of n having k columns with only nonzero entries (0<=k<=floor(n/2)).

n	a(n)
0	1
1	2
2	6
3	1
4	18
5	6
6	54
7	27
8	1
9	162
10	108
11	10
12	486
13	405
14	64
15	1
16	1458
17	1458
18	334
19	14
20	4374
21	5103
22	1549
23	117
24	1
25	13122
26	17496
27	6652
28	760
29	18
30	39366
31	59049
32	27064
33	4238
34	186
35	1
36	118098
37	196830
38	105796
39	21324
40	1450
41	22
42	354294
43	649539
44	401041
45	99646
46	9480
47	271

[1, 2, 6, 1, 18, 6, 54, 27, 1, 162, 108, 10, 486, 405, 64, 1, 1458, 1458, 334, 14, 4374, 5103, 1549, 117, 1, 13122, 17496, 6652, 760, 18, 39366, 59049, 27064, 4238, 186, 1, 118098, 196830, 105796, 21324, 1450, 22, 354294, 649539, 401041, 99646, 9480, 271]

cp's OEIS Frontend

A181307 Triangle read by rows: T(n,k) is the number of 2-compositions of n having k columns with only nonzero entries (0<=k<=floor(n/2)).

Table of values

List of values