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A279322 as a simple table

na(n)
10
20
32
44
514
640
7120
8352
91032
103008
118736
1225280
1372928
14209792
15601984
161723392
174923520
1814039040
1939961088
20113562624
21322244096
22913131520
232584180736
247304519680
2520624050176
2658170228736
27163908034560
28461421658112

[0,0,2,4,14,40,120,352,1032,3008,8736,25280,72928,
 209792,601984,1723392,4923520,14039040,39961088,
 113562624,322244096,913131520,2584180736,
 7304519680,20624050176,58170228736,163908034560,
 461421658112]