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A077231 as a simple table

na(n)
01
16
2240
3448
4138240
5225280
6402554880
71857945600
81010722406400
9301234913280
105859811786752
1155010477998080
129141306387333120000
137898088718655815680
141017975879293416243200
15161212016644168089600

[1,6,240,448,138240,225280,402554880,1857945600,
 1010722406400,301234913280,5859811786752,
 55010477998080,9141306387333120000,
 7898088718655815680,1017975879293416243200,
 161212016644168089600]