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A019497 as a simple table

n a(n)
0 1
1 1
2 1
3 3
4 6
5 16
6 42
7 114
8 322
9 918
10 2673
11 7875
12 23457
13 70551
14 213846
15 652794
16 2004864
17 6190612
18 19207416
19 59850384
20 187217679
21 587689947
22 1850692506
23 5845013538
24 18509607753
25 58759391013
26 186958014766
27 596108115402

[1,1,1,3,6,16,42,114,322,918,2673,7875,23457,
 70551,213846,652794,2004864,6190612,19207416,
 59850384,187217679,587689947,1850692506,
 5845013538,18509607753,58759391013,186958014766,
 596108115402]

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Last modified January 26 14:08 EST 2020. Contains 331280 sequences. (Running on oeis4.)