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A203357 as a simple table

n a(n)
1 3
2 20
3 102
4 565
5 3042
6 16538
7 89610
8 486103
9 2635899
10 14295131
11 77522409
12 420410296
13 2279906481
14 12364072580
15 67051079697
16 363621959233
17 1971943176024
18 10693963589630
19 57993991716273
20 314504819239756
21 1705578083028348

[3,20,102,565,3042,16538,89610,486103,2635899,
 14295131,77522409,420410296,2279906481,
 12364072580,67051079697,363621959233,
 1971943176024,10693963589630,57993991716273,
 314504819239756,1705578083028348]

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Last modified May 19 23:13 EDT 2022. Contains 353847 sequences. (Running on oeis4.)