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A151281 as a simple table

na(n)
01
12
26
316
448
5136
6408
71184
83552
910432
1031296
1192544
12277632
13824448
142473344
157365120
1622095360
1765920000
18197760000
19590790656
201772371968
215299916800
2215899750400
2347578857472
24142736572416
25427357700096
261282073100288
273840133464064
2811520400392192
2934517383151616
30103552149454848

[1,2,6,16,48,136,408,1184,3552,10432,31296,92544,
 277632,824448,2473344,7365120,22095360,65920000,
 197760000,590790656,1772371968,5299916800,
 15899750400,47578857472,142736572416,427357700096,
 1282073100288,3840133464064,11520400392192,
 34517383151616,103552149454848]