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A090728 as a simple table

n a(n)
0 2
1 20
2 398
3 7940
4 158402
5 3160100
6 63043598
7 1257711860
8 25091193602
9 500566160180
10 9986232009998
11 199224074039780
12 3974495248785602
13 79290680901672260
14 1581839122784659598
15 31557491774791519700
16 629567996373045734402
17 12559802435686123168340

[2,20,398,7940,158402,3160100,63043598,1257711860,
 25091193602,500566160180,9986232009998,
 199224074039780,3974495248785602,
 79290680901672260,1581839122784659598,
 31557491774791519700,629567996373045734402,
 12559802435686123168340]

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Last modified November 13 23:48 EST 2019. Contains 329106 sequences. (Running on oeis4.)