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A081180 as a simple table

na(n)
00
11
28
350
4288
51604
68800
747944
8260352
91411600
107647872
1141420576
12224294400
131214467136
146575615488
1535602384000
16192760455168
171043650265344
185650555750400
1930593342288384
20165638957801472
21896804870374400

[0,1,8,50,288,1604,8800,47944,260352,1411600,
 7647872,41420576,224294400,1214467136,6575615488,
 35602384000,192760455168,1043650265344,
 5650555750400,30593342288384,165638957801472,
 896804870374400]