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A001416 as a simple table

na(n)
01
16
260
31368
415552
5201240
62016432
721582624
8201060768
91944012744
1017257455960
11156760071600
121346073913440
1311734199738820
1498420246759688

[1,6,60,1368,15552,201240,2016432,21582624,
 201060768,1944012744,17257455960,156760071600,
 1346073913440,11734199738820,98420246759688]