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A161007 as a simple table

na(n)
00
11
22
320
472
5464
62080
711584
856448
9298240
101499648
117771136
1239536640
13203411456
141039409152
155333401600
1627297349632
17139929124864
18716615843840
193672097685504
2018810048872448
2196373660712960
22493708103385088
232529394778177536
2412958119210516480

[0,1,2,20,72,464,2080,11584,56448,298240,1499648,
 7771136,39536640,203411456,1039409152,5333401600,
 27297349632,139929124864,716615843840,
 3672097685504,18810048872448,96373660712960,
 493708103385088,2529394778177536,
 12958119210516480]