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A283517 as a simple table

n a(n)
1 0
2 1
3 20
4 270
5 2763
6 26662
7 241796
8 2115564
9 18020972
10 150431216
11 1235860816
12 10022560088
13 80412418752
14 639331124272
15 5043680344120
16 39521427506168
17 307850445104320
18 2385411084242780
19 18397022091700304
20 141285768645661084

[0,1,20,270,2763,26662,241796,2115564,18020972,
 150431216,1235860816,10022560088,80412418752,
 639331124272,5043680344120,39521427506168,
 307850445104320,2385411084242780,
 18397022091700304,141285768645661084]

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Last modified July 2 09:32 EDT 2022. Contains 354999 sequences. (Running on oeis4.)