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A047686 as a simple table

na(n)
01
13
290
32835
418900
566825
61915538625
7127702575
8186080895000
9350813659321125
107656647326453125
113018906660144375
121211517431782539131250
13144228265688397515625
14564653660170076273671875
1584913182070036240111050234375
16499921764568178729658131250000

[1,3,90,2835,18900,66825,1915538625,127702575,
 186080895000,350813659321125,7656647326453125,
 3018906660144375,1211517431782539131250,
 144228265688397515625,564653660170076273671875,
 84913182070036240111050234375,
 499921764568178729658131250000]