A058244 - OEIS

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A058244 as a simple table

n	a(n)
0	2
1	31
2	661
3	10957
4	159521
5	2176171
6	28516039
7	363466813
8	4540996847
9	55883811553
10	679646318387
11	8187297276401
12	97856581468423
13	1161936876565841
14	13719687231190253
15	161217284169143299
16	1886493380295482477

[2,31,661,10957,159521,2176171,28516039,363466813, 4540996847,55883811553,679646318387,8187297276401, 97856581468423,1161936876565841,13719687231190253, 161217284169143299,1886493380295482477]