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A068142 as a simple table

na(n)
021
1105
2210
3630
425200
532004000
6508031496000
7128015872500032496000
83670698694547655407496988066168944000
910302657959650317880463349610273001290502485245258650172717840000

[21,105,210,630,25200,32004000,508031496000,
 128015872500032496000,
 3670698694547655407496988066168944000,
 10302657959650317880463349610273001290502485245258\
 650172717840000]