A181298 - cp's OEIS frontend

A181298 The number of even entries in all the 2-compositions of n. 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	0
1	2
2	12
3	56
4	246
5	1024
6	4128
7	16248
8	62832
9	239640
10	903944
11	3379064
12	12536552
13	46215672
14	169443592
15	618303864
16	2246863624
17	8135066488
18	29358346888
19	105642047864
20	379143054472
21	1357496762744
22	4849952390792
23	17293404551544

[0, 2, 12, 56, 246, 1024, 4128, 16248, 62832, 239640, 903944, 3379064, 12536552, 46215672, 169443592, 618303864, 2246863624, 8135066488, 29358346888, 105642047864, 379143054472, 1357496762744, 4849952390792, 17293404551544]

cp's OEIS Frontend

A181298 The number of even entries in all the 2-compositions of n. 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