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A196797 as a simple table

n a(n)
1 2
2 20
3 120
4 698
5 4078
6 23920
7 140348
8 821284
9 4813216
10 28205816
11 165271574
12 968402976
13 5674170654
14 33247932210
15 194815836754
16 1141514840080
17 6688663128942
18 39191982301068
19 229644142997092
20 1345591934306596

[2,20,120,698,4078,23920,140348,821284,4813216,
 28205816,165271574,968402976,5674170654,
 33247932210,194815836754,1141514840080,
 6688663128942,39191982301068,229644142997092,
 1345591934306596]

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Last modified March 29 10:22 EDT 2024. Contains 371268 sequences. (Running on oeis4.)