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A001444 as a simple table

n a(n)
0 1
1 2
2 6
3 15
4 45
5 126
6 378
7 1107
8 3321
9 9882
10 29646
11 88695
12 266085
13 797526
14 2392578
15 7175547
16 21526641
17 64573362
18 193720086
19 581140575
20 1743421725
21 5230206126
22 15690618378
23 47071677987
24 141215033961

[1,2,6,15,45,126,378,1107,3321,9882,29646,88695,
 266085,797526,2392578,7175547,21526641,64573362,
 193720086,581140575,1743421725,5230206126,
 15690618378,47071677987,141215033961]

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Last modified June 14 21:27 EDT 2021. Contains 345041 sequences. (Running on oeis4.)