This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A242078 #28 Sep 08 2022 08:46:08 %S A242078 1,16,169,1764,17689,177241,1774224,17749369,177502329,1775105424, %T A242078 17751298756,177513070329,1775132540281,17751332312289, %U A242078 177513333968569,1775133399758224,17751334196261689,177513342503762329 %N A242078 Smallest square number > 10*a(n-1) with a(1) = 1. %H A242078 Jon E. Schoenfield, <a href="/A242078/b242078.txt">Table of n, a(n) for n = 1..250</a> %e A242078 Term after 169 cannot be 1681 because 1681 is less than 10 times 169. %t A242078 NestList[Ceiling[Sqrt[10#]]^2&,1,20] (* _Harvey P. Dale_, Sep 03 2020 *) %o A242078 (PARI) lista(nn, k=10) = {a=1; for (n=1, nn, print1(a, ", "); a = (sqrtint(a*k)+1)^2;);} \\ _Michel Marcus_, May 06 2014 %o A242078 (Magma) nMax:=100; a:=1; for n in [1..nMax] do a:=(Isqrt(a*10)+1)^2; a; end for; // _Jon E. Schoenfield_, May 06 2014 %Y A242078 Cf. other sequences with smallest square > k*a(n-1): A175627 (k=2), A060867 (k=4). %K A242078 nonn %O A242078 1,2 %A A242078 _J. Lowell_, May 03 2014