A234489 - OEIS

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A234489 as a simple table

n	a(n)
1	220334
2	765738
3	2659824
4	9288710
5	32545706
6	114484712
7	404043442
8	1431125914
9	5084793448
10	18127421166
11	64813774926
12	232475602952
13	836155485018
14	3016451992646
15	10910475434292
16	39574863492918
17	143905533079266

[220334,765738,2659824,9288710,32545706,114484712, 404043442,1431125914,5084793448,18127421166, 64813774926,232475602952,836155485018, 3016451992646,10910475434292,39574863492918, 143905533079266]