A181292 - cp's OEIS frontend

A181292 The sum of the entries in the top rows of 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)
0	0
1	1
2	7
3	36
4	164
5	700
6	2868
7	11424
8	44576
9	171216
10	649520
11	2439360
12	9085632
13	33605312
14	123561536
15	451998720
16	1646101504
17	5971400960
18	21586910976
19	77796897792
20	279594972160
21	1002326793216
22	3585117623296
23	12796737085440

[0, 1, 7, 36, 164, 700, 2868, 11424, 44576, 171216, 649520, 2439360, 9085632, 33605312, 123561536, 451998720, 1646101504, 5971400960, 21586910976, 77796897792, 279594972160, 1002326793216, 3585117623296, 12796737085440]

cp's OEIS Frontend

A181292 The sum of the entries in the top rows of 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