login

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 61st year, we have over 378,000 sequences, and we’ve reached 11,000 citations (which often say “discovered thanks to the OEIS”).

A223523 as a simple table

na(n)
11
23
32
415
520
64
7105
8210
984
108
11945
122520
131512
14288
1516
1610395
1734650
1827720
197920
20880
2132
22135135
23540540
24540540
25205920
2634320
272496
2864
292027025
309459450
3111351340
325405400
331201200
34131040
356720
36128

[1,3,2,15,20,4,105,210,84,8,945,2520,1512,288,16,
 10395,34650,27720,7920,880,32,135135,540540,
 540540,205920,34320,2496,64,2027025,9459450,
 11351340,5405400,1201200,131040,6720,128]