A059360 - OEIS

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A059360 as a simple table

n	a(n)
0	2
1	1
2	23
3	73
4	227
5	1669
6	3581
7	18097
8	19427
9	58537
10	176123
11	529393
12	2653109
13	36661237
14	33464399
15	43013953
16	597805589

[2,1,23,73,227,1669,3581,18097,19427,58537,176123, 529393,2653109,36661237,33464399,43013953, 597805589]