A181339 - cp's OEIS frontend

A181339 Largest entry in a 2-composition of n, summed over all 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)
1	2
2	9
3	38
4	149
5	562
6	2066
7	7474
8	26737
9	94900
10	334909
11	1176842
12	4121632
13	14397370
14	50185498
15	174628420
16	606755258
17	2105552976
18	7298685677
19	25275876584
20	87457546835
21	302382185770
22	1044756677132
23	3607460520006
24	12449135054480

[2, 9, 38, 149, 562, 2066, 7474, 26737, 94900, 334909, 1176842, 4121632, 14397370, 50185498, 174628420, 606755258, 2105552976, 7298685677, 25275876584, 87457546835, 302382185770, 1044756677132, 3607460520006, 12449135054480]

cp's OEIS Frontend

A181339 Largest entry in a 2-composition of n, summed over all 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