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A280777 as a simple table

na(n)
01
12
28
316
4128
51280
63072
7215040
83440640
92293760
10137625600
11201850880
1272666316800
131889324236800
1452901078630400
15176336928768000
16135426761293824
17191854578499584000
181593868805996544000
19787371190162292736000
2031494847606491709440000
2129395191099392262144000

[1,2,8,16,128,1280,3072,215040,3440640,2293760,
 137625600,201850880,72666316800,1889324236800,
 52901078630400,176336928768000,135426761293824,
 191854578499584000,1593868805996544000,
 787371190162292736000,31494847606491709440000,
 29395191099392262144000]