A278614 - OEIS

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A278614 as a simple table

n	a(n)
0	3
1	8
2	22
3	62
4	176
5	502
6	1434
7	4100
8	11726
9	33542
10	95952
11	274494
12	785266
13	2246484
14	6426742
15	18385646
16	52597744
17	150471910
18	430470890
19	1231493604

[3,8,22,62,176,502,1434,4100,11726,33542,95952, 274494,785266,2246484,6426742,18385646,52597744, 150471910,430470890,1231493604]