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”).

A001672 as a simple table

na(n)
01
13
29
331
497
5306
6961
73020
89488
929809
1093648
11294204
12924269
132903677
149122171
1528658145
1690032220
17282844563
18888582403
192791563949
208769956796
2127551631842
2286556004191
23271923706893
24854273519913
252683779414317
268431341691876
2726487841119103

[1,3,9,31,97,306,961,3020,9488,29809,93648,294204,
 924269,2903677,9122171,28658145,90032220,
 282844563,888582403,2791563949,8769956796,
 27551631842,86556004191,271923706893,854273519913,
 2683779414317,8431341691876,26487841119103]