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A003746 as a simple table

na(n)
1540
21751352
35386703316
416582103036544
551045000577926816
6157132783947988296192
7483704801377335372564480
81488997578825205151673656448
94583609224965381313988566950144

[540,1751352,5386703316,16582103036544,
 51045000577926816,157132783947988296192,
 483704801377335372564480,
 1488997578825205151673656448,
 4583609224965381313988566950144]