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A154030 as a simple table

na(n)
00
12
26
312
416
5120
630
71680
848
930240
1070
11665280
1296
1317297280
14126
15518918400
16160
1717643225600
18198
19670442572800
20240
2128158588057600
22286
231295295050649600
24336
2564764752532480000
26390
273497296636753920000
28448

[0,2,6,12,16,120,30,1680,48,30240,70,665280,96,
 17297280,126,518918400,160,17643225600,198,
 670442572800,240,28158588057600,286,
 1295295050649600,336,64764752532480000,390,
 3497296636753920000,448]