A181336 - cp's OEIS frontend

A181336 Triangle read by rows: T(n,k) is the number of 2-compositions of n having k even 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	5
7	11
8	7
9	1
10	11
11	31
12	29
13	10
14	1
15	25
16	83
17	102
18	56
19	13
20	1
21	56
22	217
23	329
24	245
25	92
26	16
27	1
28	126
29	556
30	1000
31	938
32	487
33	137
34	19
35	1
36	283
37	1403
38	2917
39	3292
40	2180
41	855
42	191
43	22
44	1
45	636
46	3498
47	8247
48	10865
49	8740
50	4406
51	1376
52	254
53	25
54	1
55	1429
56	8636
57	22756
58	34248

[1, 1, 1, 2, 4, 1, 5, 11, 7, 1, 11, 31, 29, 10, 1, 25, 83, 102, 56, 13, 1, 56, 217, 329, 245, 92, 16, 1, 126, 556, 1000, 938, 487, 137, 19, 1, 283, 1403, 2917, 3292, 2180, 855, 191, 22, 1, 636, 3498, 8247, 10865, 8740, 4406, 1376, 254, 25, 1, 1429, 8636, 22756, 34248]

cp's OEIS Frontend

A181336 Triangle read by rows: T(n,k) is the number of 2-compositions of n having k even 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