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A278692 as a simple table

n a(n)
0 4
1 14
2 49
3 171
4 596
5 2077
6 7238
7 25223
8 87897
9 306303
10 1067403
11 3719680
12 12962320
13 45171020
14 157411717
15 548547468
16 1911575138
17 6661446313
18 23213770727
19 80895217952
20 281903201529
21 982374694626
22 3423373822671
23 11929753885009
24 41572739387791
25 144872448909191
26 504850696923520
27 1759300875378480

[4,14,49,171,596,2077,7238,25223,87897,306303,
 1067403,3719680,12962320,45171020,157411717,
 548547468,1911575138,6661446313,23213770727,
 80895217952,281903201529,982374694626,
 3423373822671,11929753885009,41572739387791,
 144872448909191,504850696923520,1759300875378480]

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Last modified February 17 16:15 EST 2018. Contains 299296 sequences. (Running on oeis4.)