A243280 - OEIS

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A243280 as a simple table

n	a(n)
0	1
1	3
2	13
3	63
4	325
5	1748
6	9685
7	54841
8	315605
9	1838610
10	10811788
11	64041706
12	381525253
13	2283436938
14	13718099275
15	82672421423
16	499546587317
17	3025336228390
18	18357852413062
19	111587292429820
20	679306584310220

[1,3,13,63,325,1748,9685,54841,315605,1838610, 10811788,64041706,381525253,2283436938, 13718099275,82672421423,499546587317, 3025336228390,18357852413062,111587292429820, 679306584310220]