A276779 - OEIS

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A276779 as a simple table

n	a(n)
1	6
2	22
3	71
4	218
5	659
6	1985
7	5963
8	17898
9	53704
10	161124
11	483384
12	1450164
13	4350505
14	13051531
15	39154610
16	117463847
17	301029987
18	301029987

[6,22,71,218,659,1985,5963,17898,53704,161124, 483384,1450164,4350505,13051531,39154610, 117463847,301029987,301029987]