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A124858 as a simple table

n a(n)
0 1
1 12
2 54
3 198
4 842
5 3622
6 15984
7 71468
8 323042
9 1472022
10 6751064
11 31123148
12 144092684
13 669468708
14 3119587196
15 14572658668
16 68216250402
17 319893194558
18 1502357897232
19 7064711394284
20 33257109397452
21 156701323391972

[1,12,54,198,842,3622,15984,71468,323042,1472022,
 6751064,31123148,144092684,669468708,3119587196,
 14572658668,68216250402,319893194558,
 1502357897232,7064711394284,33257109397452,
 156701323391972]

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Last modified July 13 03:51 EDT 2020. Contains 335673 sequences. (Running on oeis4.)