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A065178 as a simple table

n a(n)
1 1
2 2
3 6
4 15
5 42
6 107
7 294
8 780
9 2128
10 5781
11 15918
12 43885
13 122010
14 340323
15 954394
16 2685930
17 7588770
18 21507696
19 61144062
20 174283887
21 498012094
22 1426213191
23 4092816966
24 11767176070
25 33890202192
26 97761428205
27 282424564744

[1,2,6,15,42,107,294,780,2128,5781,15918,43885,
 122010,340323,954394,2685930,7588770,21507696,
 61144062,174283887,498012094,1426213191,
 4092816966,11767176070,33890202192,97761428205,
 282424564744]

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Last modified January 17 18:00 EST 2020. Contains 330987 sequences. (Running on oeis4.)