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A067318 as a simple table

na(n)
10
21
37
446
5326
62556
722212
8212976
92239344
1025659360
11318540960
124261576320
1361148511360
14937030429440
1515275952518400
16264030355814400
174823280687052800
1892865738644582400
191879691760950169600
2039905092126771200000
21886664974825728000000

[0,1,7,46,326,2556,22212,212976,2239344,25659360,
 318540960,4261576320,61148511360,937030429440,
 15275952518400,264030355814400,4823280687052800,
 92865738644582400,1879691760950169600,
 39905092126771200000,886664974825728000000]