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A089424 as a simple table

n a(n)
0 1
1 1
2 2
3 3
4 6
5 18
6 48
7 151
8 478
9 1580
10 5304
11 18220
12 63308
13 222936
14 792436
15 2841807
16 10265130
17 37322728
18 136468200
19 501523066
20 1851418668 

[1,1,2,3,6,18,48,151,478,1580,5304,18220,63308,
 222936,792436,2841807,10265130,37322728,136468200,
 501523066,1851418668]

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Last modified April 23 23:26 EDT 2024. Contains 371917 sequences. (Running on oeis4.)