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A137745 as a simple table

n a(n)
0 0
1 0
2 0
3 0
4 0
5 1
6 5
7 19
8 66
9 218
10 700
11 2218
12 6997
13 22064
14 69662
15 220395
16 699090
17 2224114
18 7098773
19 22733498

[0,0,0,0,0,1,5,19,66,218,700,2218,6997,22064,
 69662,220395,699090,2224114,7098773,22733498]

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Last modified June 6 13:01 EDT 2020. Contains 334827 sequences. (Running on oeis4.)