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A142995 as a simple table

na(n)
00
11
27
389
41836
556164
62390832
7135213840
89809203968
9888117094656
1098167241088000
1113010123816064000
122036436482119680000
13371699564417796096000
1478251077775510986752000

[0,1,7,89,1836,56164,2390832,135213840,9809203968,
 888117094656,98167241088000,13010123816064000,
 2036436482119680000,371699564417796096000,
 78251077775510986752000]