A181366 - cp's OEIS frontend

A181366 Least 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	0
2	1
3	2
4	5
5	10
6	20
7	38
8	74
9	144
10	282
11	552
12	1086
13	2144
14	4247
15	8430
16	16761
17	33364
18	66479
19	132566
20	264520
21	528078
22	1054636
23	2106854
24	4209853
25	8413548
26	16817253
27	33618758
28	67212301
29	134384182
30	268703498
31	537302782
32	1074437977
33	2148606246

[0, 1, 2, 5, 10, 20, 38, 74, 144, 282, 552, 1086, 2144, 4247, 8430, 16761, 33364, 66479, 132566, 264520, 528078, 1054636, 2106854, 4209853, 8413548, 16817253, 33618758, 67212301, 134384182, 268703498, 537302782, 1074437977, 2148606246]

cp's OEIS Frontend

A181366 Least 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