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”).

A030981 as a simple table

na(n)
11
21
34
411
541
6146
7564
82199
98835
1035989
11148912
12623008
132633148
1411222160
1548181056
16208180847
17904593623
183950338043
1917328256180
2076316518987
21337332601513
221495992837550
236654367576732
2429681131861564

[1,1,4,11,41,146,564,2199,8835,35989,148912,
 623008,2633148,11222160,48181056,208180847,
 904593623,3950338043,17328256180,76316518987,
 337332601513,1495992837550,6654367576732,
 29681131861564]