A295057 - OEIS

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A295057 as a simple table

n	a(n)
0	2
1	5
2	13
3	30
4	66
5	139
6	286
7	581
8	1172
9	2355
10	4722
11	9458
12	18931
13	37878
14	75773
15	151564
16	303147
17	606314
18	1212649
19	2425320
20	4850663
21	9701350
22	19402725
23	38805476
24	77610979
25	155221986
26	310444001
27	620888033

[2,5,13,30,66,139,286,581,1172,2355,4722,9458, 18931,37878,75773,151564,303147,606314,1212649, 2425320,4850663,9701350,19402725,38805476, 77610979,155221986,310444001,620888033]