A175033 - OEIS

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A175033 as a simple table

n	a(n)
1	9
2	15
3	55
4	89
5	321
6	519
7	1871
8	3025
9	10905
10	17631
11	63559
12	102761
13	370449
14	598935
15	2159135
16	3490849
17	12584361
18	20346159
19	73347031
20	118586105
21	427497825
22	691170471

[9,15,55,89,321,519,1871,3025,10905,17631,63559, 102761,370449,598935,2159135,3490849,12584361, 20346159,73347031,118586105,427497825,691170471]