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A057409 as a simple table

n a(n)
1 1
2 2
3 6
4 19
5 63
6 216
7 756
8 2685
9 9650
10 35018
11 128084
12 471623
13 1746492
14 6499356
15 24290272
16 91123171
17 342984175
18 1294829776
19 4901319978
20 18597856445
21 70723784744
22 269486503694
23 1028736811230
24 3933715966653

[1,2,6,19,63,216,756,2685,9650,35018,128084,
 471623,1746492,6499356,24290272,91123171,
 342984175,1294829776,4901319978,18597856445,
 70723784744,269486503694,1028736811230,
 3933715966653]

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Last modified September 16 02:16 EDT 2019. Contains 327088 sequences. (Running on oeis4.)