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A220727 as a simple table

n a(n)
1 1
2 4
3 30
4 230
5 1819
6 14466
7 114900
8 913187
9 7256380
10 57664692
11 458236178
12 3641435760
13 28937067889
14 229951848995
15 1827338913535
16 14521161884614
17 115394100670410
18 916992651769082
19 7286988782183320
20 57906904219355630

[1,4,30,230,1819,14466,114900,913187,7256380,
 57664692,458236178,3641435760,28937067889,
 229951848995,1827338913535,14521161884614,
 115394100670410,916992651769082,7286988782183320,
 57906904219355630]

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Last modified November 29 21:32 EST 2021. Contains 349416 sequences. (Running on oeis4.)