A181329 - cp's OEIS frontend

A181329 Number of 2-compositions of n having no column with an even sum. 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	1
1	2
2	4
3	12
4	32
5	86
6	232
7	624
8	1680
9	4522
10	12172
11	32764
12	88192
13	237390
14	638992
15	1720000
16	4629792
17	12462194
18	33544980
19	90294348
20	243048864
21	654224230
22	1761001208
23	4740156528
24	12759266608
25	34344622042
26	92446776092
27	248842639740
28	669819565056
29	1802979787550
30	4853151929120

[1, 2, 4, 12, 32, 86, 232, 624, 1680, 4522, 12172, 32764, 88192, 237390, 638992, 1720000, 4629792, 12462194, 33544980, 90294348, 243048864, 654224230, 1761001208, 4740156528, 12759266608, 34344622042, 92446776092, 248842639740, 669819565056, 1802979787550, 4853151929120]

cp's OEIS Frontend

A181329 Number of 2-compositions of n having no column with an even sum. 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