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A188498 as a simple table

n a(n)
0 0
1 1
2 2
3 3
4 8
5 30
6 102
7 308
8 905
9 2744
10 8473
11 26112
12 79924
13 244204
14 747160
15 2288521
16 7009458
17 21461803
18 65704200
19 201162258
20 615922714
21 1885853660
22 5774072225
23 17678809840
24 54128358209
25 165728860112
26 507424764216
27 1553620027784
28 4756831354752

[0,1,2,3,8,30,102,308,905,2744,8473,26112,79924,
 244204,747160,2288521,7009458,21461803,65704200,
 201162258,615922714,1885853660,5774072225,
 17678809840,54128358209,165728860112,507424764216,
 1553620027784,4756831354752]

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Last modified December 9 19:51 EST 2019. Contains 329879 sequences. (Running on oeis4.)