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A220823 as a simple table

n a(n)
1 3
2 6
3 28
4 156
5 948
6 6206
7 42504
8 301548
9 2195100
10 16307598
11 123128940
12 942125110
13 7289062320
14 56926578912
15 448186662992
16 3553364598786
17 28345260090444
18 227337020914322
19 1832102040838776
20 14828608892376288
21 120485979704314764
22 982422914174633154
23 8036158136627878572

[3,6,28,156,948,6206,42504,301548,2195100,
 16307598,123128940,942125110,7289062320,
 56926578912,448186662992,3553364598786,
 28345260090444,227337020914322,1832102040838776,
 14828608892376288,120485979704314764,
 982422914174633154,8036158136627878572]

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Last modified January 18 13:49 EST 2020. Contains 331010 sequences. (Running on oeis4.)