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A371768 as a simple table

na(n)
00
12
26
334
4220
51868
618648
7222696
83061728
948199392
10852857280
1116813212480
12365177928960
138671294183680
14223409173317120
156207795845798400
16185021865565286400
175887763630809804800
18199220359130518118400
197141874528908565913600
20270391380094261923840000

[0,2,6,34,220,1868,18648,222696,3061728,48199392,
 852857280,16813212480,365177928960,8671294183680,
 223409173317120,6207795845798400,
 185021865565286400,5887763630809804800,
 199220359130518118400,7141874528908565913600,
 270391380094261923840000]