A163735 - OEIS

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A163735 as a simple table

n	a(n)
1	1
2	2
3	9
4	13
5	29
6	87
7	299
8	917
9	2589
10	7059
11	19075
12	51111
13	135445
14	355377
15	925723
16	2398807
17	6190289
18	15920685
19	40835851
20	104520403
21	267077847

[1,2,9,13,29,87,299,917,2589,7059,19075,51111, 135445,355377,925723,2398807,6190289,15920685, 40835851,104520403,267077847]