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 A303368 #9 May 07 2018 07:19:20 %S A303368 1,2,3,4,5,6,7,21,133,432,525,1200,1456,1904,4774,24583,281048,289820, %T A303368 333293,420239,428752,430686,437554,500380,500888,736600,941578, %U A303368 984377,1027176,1069975,1112774,1155573,1662216,1776201,2087008,3212235,7928375,8131725 %N A303368 Numbers equal to the determinant of a circulant matrix based on the base-8 digits of n. %C A303368 Base 8 variant of A219327. %o A303368 (PARI) (c(v)=abs(matdet(matrix(#v,#v,i,j,v[(j-i)%#v+1]))));for(n=1,oo,n==c(digits(n,8))&&print1(n",")) %Y A303368 Cf. A303367 (base 7), A303369 (base 9), A219327 (base 10). %K A303368 nonn,base %O A303368 1,2 %A A303368 _M. F. Hasler_, May 05 2018 %E A303368 a(33)-a(38) from _Giovanni Resta_, May 07 2018