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A135030 as a simple table

n a(n)
0 0
1 1
2 6
3 38
4 240
5 1516
6 9576
7 60488
8 382080
9 2413456
10 15244896
11 96296288
12 608267520
13 3842197696
14 24269721216
15 153302722688
16 968355778560
17 6116740116736
18 38637152257536
19 244056393778688
20 1541612667187200

[0,1,6,38,240,1516,9576,60488,382080,2413456,
 15244896,96296288,608267520,3842197696,
 24269721216,153302722688,968355778560,
 6116740116736,38637152257536,244056393778688,
 1541612667187200]

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Last modified February 20 14:49 EST 2019. Contains 320327 sequences. (Running on oeis4.)