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A171309 as a simple table

n a(n)
1 4
2 15
3 53
4 138
5 483
6 1678
7 5634
8 18915
9 62325
10 204315
11 683210
12 2277118
13 7559559
14 25132611
15 83206528
16 274465209
17 907716605
18 3004041236
19 9908081432 

[4,15,53,138,483,1678,5634,18915,62325,204315,
 683210,2277118,7559559,25132611,83206528,
 274465209,907716605,3004041236,9908081432]

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Last modified April 24 20:08 EDT 2024. Contains 371963 sequences. (Running on oeis4.)