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A268148 as a simple table

na(n)
00
18
2768
330720
4917504
523592960
6553648128
712213813248
8257698037760
95257039970304
10104453604638720
112031897488130048
1238843546786070528
13731834939447705600
1413618885273168379904
15250760427251989217280
164574792530279968800768
1782788987402808467652608

[0,8,768,30720,917504,23592960,553648128,
 12213813248,257698037760,5257039970304,
 104453604638720,2031897488130048,
 38843546786070528,731834939447705600,
 13618885273168379904,250760427251989217280,
 4574792530279968800768,82788987402808467652608]