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A000507 as a simple table

na(n)
661
71385
819028
9206276
101949762
1116889786
12137963364
131081702420
148236142455
1561386982075
16450403628440
173266265481144
1823480284103492
19167687984079924
201191656966048088
218436830209386360
2259563995267159825
23419628657826253805

[61,1385,19028,206276,1949762,16889786,137963364,
 1081702420,8236142455,61386982075,450403628440,
 3266265481144,23480284103492,167687984079924,
 1191656966048088,8436830209386360,
 59563995267159825,419628657826253805]