cp's OEIS Frontend

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.

Previous Showing 11-12 of 12 results.

A209342 Number of n-bead necklaces labeled with numbers -6..6 allowing reversal, with sum zero with no three beads in a row equal.

Original entry on oeis.org

1, 7, 24, 205, 1724, 16968, 172610, 1830872, 19860306, 219630346, 2464760150, 28002352120
Offset: 1

Views

Author

R. H. Hardin, Mar 06 2012

Keywords

Comments

Column 6 of A209344.

Examples

			Some solutions for n=6:
.-5...-5...-5...-3...-6...-4...-6...-6...-6...-4...-4...-5...-5...-6...-5...-6
..0...-2....3....3....3...-2...-6....5....3...-3...-1...-2...-5...-1...-4....4
..2....1...-4...-3...-5....6....2...-6....5....1....1...-2....3....4....6...-5
.-3...-2....4....3....2...-4....3....5...-5....3....4....5....2....4....6....6
..2....3...-2...-3....3....3....2...-3...-1....0....0....2....0...-3...-5...-5
..4....5....4....3....3....1....5....5....4....3....0....2....5....2....2....6

A209343 Number of n-bead necklaces labeled with numbers -7..7 allowing reversal, with sum zero with no three beads in a row equal.

Original entry on oeis.org

1, 8, 31, 311, 3045, 34720, 409199, 5016681, 62896466, 803647811, 10420410009, 136780924152
Offset: 1

Views

Author

R. H. Hardin, Mar 06 2012

Keywords

Comments

Column 7 of A209344.

Examples

			Some solutions for n=6:
.-5...-6...-7...-7...-3...-6...-7...-6...-6...-7...-7...-6...-7...-6...-5...-5
.-1....3...-2....0...-2...-5....3...-1...-3...-1...-2...-4...-5...-2...-4....0
.-1...-4....4...-1....7....6...-1....3....1....0....2....3....2....2....3....0
..5...-1....5....0...-1....6...-1....4....3....4....1....3...-3....4...-1...-3
.-1....3...-7....1...-2...-2....1....0....4...-1....3....1....7...-5....2....2
..3....5....7....7....1....1....5....0....1....5....3....3....6....7....5....6
Previous Showing 11-12 of 12 results.

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

Content is available under The OEIS End-User License Agreement.