A233298 - OEIS

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A233298 as a simple table

n	a(n)
1	13
2	42
3	141
4	502
5	1739
6	5964
7	20185
8	67609
9	224165
10	737347
11	2407911
12	7814616
13	25223004
14	81015137
15	259099567
16	825507109
17	2621224089
18	8298060296
19	26197890927
20	82506334112
21	259260476024

[13,42,141,502,1739,5964,20185,67609,224165, 737347,2407911,7814616,25223004,81015137, 259099567,825507109,2621224089,8298060296, 26197890927,82506334112,259260476024]