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A012001 as a simple table

na(n)
00
11
22
346
41112
555816
63804272
7372397936
847682319232
97841034902656
101601250315636992
11398250217200414976
12118406090377889303552
1341478295178427681104896
1416904918898000336224294912

[0,1,2,46,1112,55816,3804272,372397936,
 47682319232,7841034902656,1601250315636992,
 398250217200414976,118406090377889303552,
 41478295178427681104896,
 16904918898000336224294912]