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A000505 as a simple table

na(n)
51
657
71191
815619
9156190
101310354
119738114
1266318474
13423281535
142571742175
1515041229521
1685383238549
17473353301060
182575022097600
1913796160184500
2073008517581444
21382493246941965
221987497491971605
2310258045633638475

[1,57,1191,15619,156190,1310354,9738114,66318474,
 423281535,2571742175,15041229521,85383238549,
 473353301060,2575022097600,13796160184500,
 73008517581444,382493246941965,1987497491971605,
 10258045633638475]