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A020089 as a simple table

n a(n)
0 1
1 0
2 0
3 1
4 3
5 14
6 79
7 505
8 3710
9 30920
10 288591
11 2982109
12 33797240
13 416832633
14 5557768440
15 79661347641
16 1221473997164
17 19950741953681
18 345812860530487
19 6339902443058941
20 122571447232472865
21 2492286093726948268

[1,0,0,1,3,14,79,505,3710,30920,288591,2982109,
 33797240,416832633,5557768440,79661347641,
 1221473997164,19950741953681,345812860530487,
 6339902443058941,122571447232472865,
 2492286093726948268]

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Last modified February 20 14:52 EST 2019. Contains 320327 sequences. (Running on oeis4.)