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A261937
as a simple table
n
a(n)
1
0
2
2
3
5
4
12
5
31
6
57
7
112
8
296
9
833
10
1889
11
5015
12
11625
13
30782
14
80154
15
202448
16
526705
17
1410549
18
3698903
[0,2,5,12,31,57,112,296,833,1889,5015,11625,30782, 80154,202448,526705,1410549,3698903]