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”).

A247895 as a simple table

na(n)
13
27
313
431
569
6190
7444
81052
92702
106455
1115928
1240073
13100370
14251707
15637321
161617175
174124448
1810553415
1927066978
2069709680
21179992909
22465769803
231208198532
243140421716
258179002120
2621338685408
2755762149030
28145935689361
29382465573486
301003652347100

[3,7,13,31,69,190,444,1052,2702,6455,15928,40073,
 100370,251707,637321,1617175,4124448,10553415,
 27066978,69709680,179992909,465769803,1208198532,
 3140421716,8179002120,21338685408,55762149030,
 145935689361,382465573486,1003652347100]