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A153921 as a simple table

n a(n)
0 1
1 2
2 4
3 10
4 28
5 148
6 714
7 6039
8 49623
9 697824
10 9570390
11 228608398
12 5268376882
13 211052632687
14 8181458661819
15 550685739585810
16 35868897568521948
17 4059582510922093828
18 444431993377350866570
19 84536428851931450778591

[1,2,4,10,28,148,714,6039,49623,697824,9570390,
 228608398,5268376882,211052632687,8181458661819,
 550685739585810,35868897568521948,
 4059582510922093828,444431993377350866570,
 84536428851931450778591]

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Last modified February 17 15:32 EST 2020. Contains 331998 sequences. (Running on oeis4.)