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A240778 as a simple table

n a(n)
1 1
2 4
3 20
4 97
5 459
6 2187
7 10442
8 49861
9 238068
10 1136678
11 5427201
12 25912833
13 123723975
14 590735140
15 2820536641
16 13466994652
17 64299801122
18 307007207679
19 1465843189533
20 6998846289463
21 33416841401200
22 159552766705917

[1,4,20,97,459,2187,10442,49861,238068,1136678,
 5427201,25912833,123723975,590735140,2820536641,
 13466994652,64299801122,307007207679,
 1465843189533,6998846289463,33416841401200,
 159552766705917]

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Last modified June 22 16:01 EDT 2021. Contains 345386 sequences. (Running on oeis4.)