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A319872 as a simple table

na(n)
18
256
3336
41680
56720
620160
740320
840320
940336
1040560
1143680
1284000
13564480
145806080
1557697920
16518958720
17518958744
18518959272
19518970864
20519213744
21524059200
22615867840
232263322880
2430173149440
2530173149472
2630173150432
2730173179200
2830174012480

[8,56,336,1680,6720,20160,40320,40320,40336,40560,
 43680,84000,564480,5806080,57697920,518958720,
 518958744,518959272,518970864,519213744,524059200,
 615867840,2263322880,30173149440,30173149472,
 30173150432,30173179200,30174012480]