A181328 - cp's OEIS frontend

A181328 Number of columns with an even sum in 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	0
2	3
3	12
4	59
5	248
6	1024
7	4080
8	15948
9	61312
10	232792
11	874864
12	3260360
13	12064928
14	44378984
15	162399504
16	591613880
17	2146724864
18	7762397576
19	27980907248
20	100580448920
21	360636908000
22	1290131211432
23	4605675085008
24	16410645183928

[0, 0, 3, 12, 59, 248, 1024, 4080, 15948, 61312, 232792, 874864, 3260360, 12064928, 44378984, 162399504, 591613880, 2146724864, 7762397576, 27980907248, 100580448920, 360636908000, 1290131211432, 4605675085008, 16410645183928]

cp's OEIS Frontend

A181328 Number of columns with an even sum in 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