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A278681 as a simple table

n a(n)
0 3
1 16
2 85
3 451
4 2392
5 12686
6 67280
7 356818
8 1892376
9 10036172
10 53226604
11 282286052
12 1497097488
13 7939821584
14 42108658448
15 223322287224
16 1184384537744
17 6281355751296
18 33313023614352
19 176674843181968
20 936990907061504
21 4969309405367264
22 26354616443092800
23 139771093164846816
24 741272730213321216
25 3931322622695991104

[3,16,85,451,2392,12686,67280,356818,1892376,
 10036172,53226604,282286052,1497097488,7939821584,
 42108658448,223322287224,1184384537744,
 6281355751296,33313023614352,176674843181968,
 936990907061504,4969309405367264,
 26354616443092800,139771093164846816,
 741272730213321216,3931322622695991104]

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Last modified February 20 07:15 EST 2018. Contains 299359 sequences. (Running on oeis4.)