A181367 - cp's OEIS frontend

A181367 Number of 2-compositions of n containing at least one 0 entry. 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	6
3	22
4	78
5	272
6	940
7	3232
8	11080
9	37920
10	129648
11	443008
12	1513248
13	5168000
14	17647552
15	60258304
16	205746304
17	702484992
18	2398480128
19	8189016064
20	27959235072
21	95459170304
22	325918735360
23	1112757649408
24	3799195224064

[2, 6, 22, 78, 272, 940, 3232, 11080, 37920, 129648, 443008, 1513248, 5168000, 17647552, 60258304, 205746304, 702484992, 2398480128, 8189016064, 27959235072, 95459170304, 325918735360, 1112757649408, 3799195224064]

cp's OEIS Frontend

A181367 Number of 2-compositions of n containing at least one 0 entry. 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