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A271217 as a simple table

n a(n)
0 1
1 2
2 2
3 6
4 22
5 50
6 274
7 598
8 4486
9 9570
10 90914
11 191398
12 2201078
13 4593554
14 62012978
15 128619510
16 1993602406
17 4115824322
18 72026925634
19 148169675590
20 2889308674006

[1,2,2,6,22,50,274,598,4486,9570,90914,191398,
 2201078,4593554,62012978,128619510,1993602406,
 4115824322,72026925634,148169675590,2889308674006]

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Last modified June 16 11:31 EDT 2024. Contains 373429 sequences. (Running on oeis4.)