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A188782 as a simple table

na(n)
10
20
30
4784
540496
6451104
72803552
812139552
941792672
10121269248
11310362944
12718151344
131534460624
143067048224
155801302304
1610464095808
1718125622336
1830299632896
1949104515712
2077410664016
21119081302128
22179178580768

[0,0,0,784,40496,451104,2803552,12139552,41792672,
 121269248,310362944,718151344,1534460624,
 3067048224,5801302304,10464095808,18125622336,
 30299632896,49104515712,77410664016,119081302128,
 179178580768]