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A028683 as a simple table

na(n)
01
1420
281496800
36988909668048000
4264339188251171547754240000
54409145118315866486641282521305984000000
632432910584848683243891703579686352553931989191680000000

[1,420,81496800,6988909668048000,
 264339188251171547754240000,
 4409145118315866486641282521305984000000,
 32432910584848683243891703579686352553931989191680\
 000000]