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A046248 as a simple table

na(n)
10
21
38
42744
54913000
66128487
710618986392
813481272000
923300532400328
1023716588941891
1129138498659648
1251186306590680184
1352171080143896000
1463936660906500032
15112455476846227241000
16112609104493770863343

[0,1,8,2744,4913000,6128487,10618986392,
 13481272000,23300532400328,23716588941891,
 29138498659648,51186306590680184,
 52171080143896000,63936660906500032,
 112455476846227241000,112609104493770863343]