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A012166 as a simple table

na(n)
01
13
249
31915
4143905
517011475
62994791825
7719040113675
8229441987074625
992824148885459875
1046824601078366320625
1128633111489683067566875
1220964654070778933185750625
1318047023186844734022903421875

[1,3,49,1915,143905,17011475,2994791825,
 719040113675,229441987074625,92824148885459875,
 46824601078366320625,28633111489683067566875,
 20964654070778933185750625,
 18047023186844734022903421875]