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A005775 as a simple table

n a(n)
3 1
4 4
5 14
6 45
7 140
8 427
9 1288
10 3858
11 11505
12 34210
13 101530
14 300950
15 891345
16 2638650
17 7809000
18 23107488
19 68375547
20 202336092
21 598817490
22 1772479905
23 5247421410
24 15538054455
25 46019183840
26 136325212750
27 403933918375
28 1197131976846
29 3548715207534
30 10521965227669

[1,4,14,45,140,427,1288,3858,11505,34210,101530,
 300950,891345,2638650,7809000,23107488,68375547,
 202336092,598817490,1772479905,5247421410,
 15538054455,46019183840,136325212750,403933918375,
 1197131976846,3548715207534,10521965227669]

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Last modified February 23 08:36 EST 2019. Contains 320420 sequences. (Running on oeis4.)