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A308615 as a simple table

na(n)
01
18
2320
346592
410915840
5128911704064
63114038000353280
7798410297854394368
835228168150276083007094784
972984567358962659964369885986816
102104733804502091904066890388853154119680
11146449616359318768962787815768964807513279037440

[1,8,320,46592,10915840,128911704064,
 3114038000353280,798410297854394368,
 35228168150276083007094784,
 72984567358962659964369885986816,
 2104733804502091904066890388853154119680,
 146449616359318768962787815768964807513279037440]