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A307439 as a simple table

n a(n)
0 1
1 1
2 4
3 22
4 150
5 1198
6 10900
7 111392
8 1268816
9 16029676
10 223672208
11 3431679208
12 57595357568
13 1051552630592
14 20766322925296
15 441147381668704
16 10029896993061488
17 242949296094059648
18 6244343162806585552
19 169693360047016652048
20 4860575220802324411120
21 146335002352369970686352

[1,1,4,22,150,1198,10900,111392,1268816,16029676,
 223672208,3431679208,57595357568,1051552630592,
 20766322925296,441147381668704,10029896993061488,
 242949296094059648,6244343162806585552,
 169693360047016652048,4860575220802324411120,
 146335002352369970686352]

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Last modified October 22 08:00 EDT 2019. Contains 328315 sequences. (Running on oeis4.)