A181332 - cp's OEIS frontend

A181332 Triangle read by rows: T(n,k) is the number of 2-compositions of n having k nonzero entries in the top row. A 2-composition of n is a nonnegative matrix with two rows, such that each column has at least one nonzero entry and whose entries sum up to n.

n	a(n)
0	1
1	1
2	1
3	2
4	4
5	1
6	4
7	12
8	7
9	1
10	8
11	32
12	31
13	10
14	1
15	16
16	80
17	111
18	59
19	13
20	1
21	32
22	192
23	351
24	268
25	96
26	16
27	1
28	64
29	448
30	1023
31	1037
32	530
33	142
34	19
35	1
36	128
37	1024
38	2815
39	3598
40	2435
41	924
42	197
43	22
44	1
45	256
46	2304
47	7423
48	11535
49	9843
50	4923
51	1477
52	261
53	25
54	1
55	512
56	5120
57	18943
58	34832

[1, 1, 1, 2, 4, 1, 4, 12, 7, 1, 8, 32, 31, 10, 1, 16, 80, 111, 59, 13, 1, 32, 192, 351, 268, 96, 16, 1, 64, 448, 1023, 1037, 530, 142, 19, 1, 128, 1024, 2815, 3598, 2435, 924, 197, 22, 1, 256, 2304, 7423, 11535, 9843, 4923, 1477, 261, 25, 1, 512, 5120, 18943, 34832]

cp's OEIS Frontend

A181332 Triangle read by rows: T(n,k) is the number of 2-compositions of n having k nonzero entries in the top row. A 2-composition of n is a nonnegative matrix with two rows, such that each column has at least one nonzero entry and whose entries sum up to n.

Table of values

List of values