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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.

A188252 Number of arrangements of 6 nonzero numbers x(i) in -n..n with the sum of x(i)*x(i+1) equal to zero.

Original entry on oeis.org

0, 300, 1632, 7092, 16484, 43440, 75080, 142532, 232432, 380244, 525668, 841504, 1099064, 1531092, 2070976, 2785252, 3396316, 4539424, 5414024, 6981628, 8554708, 10387240, 11982424, 15101088, 17498972
Offset: 1

Views

Author

R. H. Hardin Mar 25 2011

Keywords

Comments

Row 4 of A188249

Examples

			Some solutions for n=4
.-4....2...-4...-1....2....4....3....4....3....3....1...-3...-1...-2...-3....3
..1...-3...-2....2...-1...-1....1...-2...-2....4...-4....3....3....3...-1...-4
.-2...-3...-4...-1...-2...-2...-2....2....2....4...-4....1...-2....1...-2...-4
.-4....3....4...-4....1....2...-4...-2...-1...-2....1....2....3....3....2...-4
..1....3...-3...-3...-1....2....3...-4...-4....4...-4...-4....3....1....1....4
..2...-1...-4....4...-3....1....1...-2...-2...-3....1...-3....2...-3...-3...-1

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