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A177963 as a simple table

na(n)
21
34
4576
51625702400
613168189440000
77600054456551997440000
8437763136697395052544000000
95919012181389927685417441689600000000
10162644002617632464507038883409628607021056000000000000

[1,4,576,1625702400,13168189440000,
 7600054456551997440000,
 437763136697395052544000000,
 5919012181389927685417441689600000000,
 16264400261763246450703888340962860702105600000000\
 0000]