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 A300328 #22 Mar 04 2018 10:30:11 %S A300328 2,0,4,4,2,2,8,0,8,0,8,6,6,6,6,0,20,0,24,0,20,20,18,18,18,18,18,18,64, %T A300328 0,64,0,64,0,64,0,60,56,56,58,56,56,58,56,56,0,204,0,204,0,208,0,204, %U A300328 0,204,188,186,186,186,186,186,186,186,186,186,186 %N A300328 Triangle read by rows: row n gives the number of solutions to +-1 +- 2 +- 3 +- ... +- n == k (mod n). %H A300328 Seiichi Manyama, <a href="/A300328/b300328.txt">Rows n = 1..140, flattened</a> %e A300328 First few rows are: %e A300328 2; %e A300328 0, 4; %e A300328 4, 2, 2; %e A300328 8, 0, 8, 0; %e A300328 8, 6, 6, 6, 6; %e A300328 0, 20, 0, 24, 0, 20; %e A300328 20, 18, 18, 18, 18, 18, 18; %e A300328 64, 0, 64, 0, 64, 0, 64, 0; %Y A300328 Cf. A000079 (row sums), A300190, A300324, A300329. %K A300328 nonn,tabl %O A300328 1,1 %A A300328 _Seiichi Manyama_, Mar 03 2018