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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.

A188362 Number of arrangements of 7 numbers x(i) in -n..n with the sum of x(i)*x(i+1) equal to zero.

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%I A188362 #6 Jul 22 2025 11:10:32
%S A188362 627,9153,49747,181449,480363,1171345,2295051,4409889,7651651,
%T A188362 12818961,19584123,30982585,44149827,63627969,89493523,123568713
%N A188362 Number of arrangements of 7 numbers x(i) in -n..n with the sum of x(i)*x(i+1) equal to zero.
%C A188362 Row 6 of A188358
%e A188362 Some solutions for n=4
%e A188362 ..0....4....0...-1....0....1...-1...-1....0....2....3....0....1...-1....1...-3
%e A188362 ..0...-1....0....0....0...-1...-1...-2...-2....0...-2...-3...-2...-1...-2...-4
%e A188362 .-2....4....0...-1....3...-1....1....1....0...-2....1....2....1...-2...-2....4
%e A188362 .-3...-1....4...-3....1....0....3...-4....4....1....0....1....4....1....3....0
%e A188362 ..2....0....0....1...-3....3...-1...-1....1....0....1....0...-2...-1....2...-1
%e A188362 ..0....3....0....2....0....0....0....1....2...-2....2...-1...-2....0....2....2
%e A188362 ..4....4...-2...-1....3....4...-3....1...-3...-1....3...-4...-2...-3...-3....3
%K A188362 nonn
%O A188362 1,1
%A A188362 _R. H. Hardin_ Mar 28 2011

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