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A261756
as a simple table
n
a(n)
1
0
2
19
3
19
4
99
5
138
6
197
7
380
8
2580
9
5892
10
10199
11
47851
12
139642
13
450312
14
1068661
15
2955411
16
13601486
17
48492065
[0,19,19,99,138,197,380,2580,5892,10199,47851, 139642,450312,1068661,2955411,13601486,48492065]