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A178874 as a simple table

n a(n)
0 0
1 1
2 4
3 20
4 98
5 489
6 2442
7 12208
8 61036
9 305177
10 1525880
11 7629396
12 38146974
13 190734865
14 953674318
15 4768371584
16 23841857912
17 119209289553
18 596046447756
19 2980232238772
20 14901161193850
21 74505805969241
22 372529029846194

[0,1,4,20,98,489,2442,12208,61036,305177,1525880,
 7629396,38146974,190734865,953674318,4768371584,
 23841857912,119209289553,596046447756,
 2980232238772,14901161193850,74505805969241,
 372529029846194]

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Last modified December 4 05:11 EST 2016. Contains 278748 sequences.