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A218988 as a simple table

n a(n)
0 4
1 19
2 91
3 439
4 2119
5 10231
6 49399
7 238519
8 1151671
9 5560759
10 26849719
11 129641911
12 625966519
13 3022433719
14 14593600951
15 70464138679
16 340230958519
17 1642780388791
18 7932045389239
19 38299303112119
20 184925394005431
21 892898788470199
22 4311296729902519

[4,19,91,439,2119,10231,49399,238519,1151671,
 5560759,26849719,129641911,625966519,3022433719,
 14593600951,70464138679,340230958519,
 1642780388791,7932045389239,38299303112119,
 184925394005431,892898788470199,4311296729902519]

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Last modified February 22 15:52 EST 2019. Contains 320399 sequences. (Running on oeis4.)