The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A208804 Number of n-bead necklaces labeled with numbers -7..7 allowing reversal, with sum zero and three times sum of squares <= n*(7)*(7+1). 1
 1, 5, 22, 201, 1827, 21227, 243678, 2951235, 37509753, 473996108, 6076893848, 80987915371, 1065626336007, 14153929259801, 193667696486438, 2610764121932745, 35428434842511617, 493224952143247713, 6763266087728449466, 93152055287986212052 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 LINKS Andrew Howroyd, Table of n, a(n) for n = 1..40 EXAMPLE Some solutions for n=6: .-4...-5...-5...-5...-6...-7...-3...-5...-3...-5...-4...-5...-5...-5...-5...-3 .-1...-3....0....1...-2....3...-2...-3...-3...-3...-3....0...-2...-2....1...-2 .-3...-3...-2...-4....4...-3....0....2...-2....1...-3...-5....1...-3...-4....0 ..7....2....6....0...-3....0...-3...-4....5....7....4....4...-4....5....5....5 ..1....3....1....4....2....4....3....6...-1...-3....4....2....6....3....0...-1 ..0....6....0....4....5....3....5....4....4....3....2....4....4....2....3....1 CROSSREFS Column 7 of A208805. Sequence in context: A239982 A129437 A048252 * A066866 A115657 A066865 Adjacent sequences:  A208801 A208802 A208803 * A208805 A208806 A208807 KEYWORD nonn AUTHOR R. H. Hardin, Mar 01 2012 EXTENSIONS a(12)-a(20) from Andrew Howroyd, Mar 02 2017 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified August 13 11:30 EDT 2022. Contains 356091 sequences. (Running on oeis4.)