login

A001253 as a simple table

na(n)
10
20
30
40
52
620
7198
82048
922468
10264538
113340962
1245173518
13652209564
1410024669626
15163546399460
162823941647390
1751468705947590
18987671243816650
1919909066390361346
20420650676776338140
219297308938203169622
22214562999510569012168

[0,0,0,0,2,20,198,2048,22468,264538,3340962,
 45173518,652209564,10024669626,163546399460,
 2823941647390,51468705947590,987671243816650,
 19909066390361346,420650676776338140,
 9297308938203169622,214562999510569012168]