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A063683 as a simple table

n a(n)
1 1
2 3
3 6
4 21
5 50
6 108
7 364
8 987
9 1938
10 6150
11 17622
12 34776
13 121160
14 306852
15 549000
16 2178309
17 5701290
18 11197764
19 39083988
20 93031050
21 191708244
22 697884066
23 1836283246
24 3605645232
25 11442062750
26 32888033880
27 64700678454

[1,3,6,21,50,108,364,987,1938,6150,17622,34776,
 121160,306852,549000,2178309,5701290,11197764,
 39083988,93031050,191708244,697884066,1836283246,
 3605645232,11442062750,32888033880,64700678454]

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Last modified June 21 15:37 EDT 2021. Contains 345364 sequences. (Running on oeis4.)