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A000948
as a simple table
n
a(n)
7
0
8
3
9
20
10
99
11
450
12
1896
13
7771
14
30895
15
121144
16
468409
17
1796584
18
6841014
19
25925062
[0,3,20,99,450,1896,7771,30895,121144,468409, 1796584,6841014,25925062]