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A019998 as a simple table

n a(n)
0 2
1 4
2 7
3 14
4 87
5 110
6 178
7 1551
8 2311
9 2820
10 2862
11 5158
12 9267
13 15867
14 25023
15 34363
16 68486
17 2570490
18 4313372
19 21511363
20 22412883
21 54933234
22 66947210
23 341535842
24 995434171
25 1491645143
26 4258696422
27 26212684635
28 28500533228

[2,4,7,14,87,110,178,1551,2311,2820,2862,5158,
 9267,15867,25023,34363,68486,2570490,4313372,
 21511363,22412883,54933234,66947210,341535842,
 995434171,1491645143,4258696422,26212684635,
 28500533228]

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Last modified July 30 17:25 EDT 2014. Contains 245072 sequences.