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A197649 as a simple table

n a(n)
0 0
1 1
2 7
3 31
4 115
5 390
6 1254
7 3893
8 11789
9 35045
10 102695
11 297516
12 853932
13 2432041
14 6881395
15 19361995
16 54214939
17 151164018
18 419910354
19 1162585565
20 3209268665
21 8835468881
22 24266461007
23 66501634776
24 181882282200
25 496539007825
26 1353272290399
27 3682496714743

[0,1,7,31,115,390,1254,3893,11789,35045,102695,
 297516,853932,2432041,6881395,19361995,54214939,
 151164018,419910354,1162585565,3209268665,
 8835468881,24266461007,66501634776,181882282200,
 496539007825,1353272290399,3682496714743]

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Last modified February 23 23:56 EST 2018. Contains 299595 sequences. (Running on oeis4.)