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A001448 as a simple table

na(n)
01
16
270
3924
412870
5184756
62704156
740116600
8601080390
99075135300
10137846528820
112104098963720
1232247603683100
13495918532948104
147648690600760440
15118264581564861424
161832624140942590534
1728453041475240576740
18442512540276836779204
196892620648693261354600

[1,6,70,924,12870,184756,2704156,40116600,
 601080390,9075135300,137846528820,2104098963720,
 32247603683100,495918532948104,7648690600760440,
 118264581564861424,1832624140942590534,
 28453041475240576740,442512540276836779204,
 6892620648693261354600]