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 A303261 #19 Apr 30 2018 11:42:04 %S A303261 1,28,35,1936,2761,3421,3732,4043,4354,281048,289820,333293,420239, %T A303261 428752,430686,437554,500380,500888,736600,941578,984377,1027176, %U A303261 1069975,1112774,1155573,1662216,1776201,2087008,5331625,6825024,7014400 %N A303261 Numbers having n digits in base n+1, and equal to the determinant of a circulant matrix based on these digits. %C A303261 A subsequence of A303262, namely, the terms in row n which correspond to n-digit numbers in base n+1. %o A303261 (PARI) for(n=1, 10, for(k=(n+1)^(n-1), (n+1)^n-1, d=Vec(digits(k, n+1)); abs(matdet(matrix(n, n, i, j, d[(j-i)%n+1])))==k&&print1(k", "))) %Y A303261 Cf. A303262, A303260, A219324, A219325, A219326, A219327. %K A303261 nonn,base,more %O A303261 1,2 %A A303261 _M. F. Hasler_, Apr 25 2018