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”).

A090576 as a simple table

na(n)
01
14
212
340
4128
5412
61251
74026
812362
939624
10120012
11379132
121130914
133530916
1410402781
1532112656
1693427431

[1,4,12,40,128,412,1251,4026,12362,39624,120012,
 379132,1130914,3530916,10402781,32112656,93427431]