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A133594 as a simple table

n a(n)
0 1
1 3
2 18
3 90
4 486
5 2538
6 13446
7 70794
8 373734
9 1970730
10 10396998
11 54839754
12 289283238
13 1525926762
14 8049179142
15 42458658570
16 223966125414
17 1181402279082
18 6231800342214
19 32872228375626
20 173398289233446
21 914661608207850

[1,3,18,90,486,2538,13446,70794,373734,1970730,
 10396998,54839754,289283238,1525926762,8049179142,
 42458658570,223966125414,1181402279082,
 6231800342214,32872228375626,173398289233446,
 914661608207850]

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Last modified April 19 11:30 EDT 2024. Contains 371791 sequences. (Running on oeis4.)