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

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A208974 Number of 7-bead necklaces labeled with numbers -n..n allowing reversal, with sum zero and first and second differences in -n..n. 1
 2, 15, 87, 371, 1185, 3186, 7425, 15658, 30368, 55222, 95087, 156612, 248194, 380753, 567639, 825586, 1174510, 1638724, 2246594, 3032025, 4033918, 5298001, 6876080, 8828154, 11221516, 14133153, 17648642, 21864897, 26888831, 32840460, 39851308 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Row 7 of A208970. LINKS R. H. Hardin, Table of n, a(n) for n = 1..79 EXAMPLE Some solutions for n=5: -5 -4 -3 -3 -1 -4 -3 -1 -4 -3 -3 -4 -4 -3 -2 -1 -3 -3 -3 -1 -1 -2 -3 -1 -2 -3 -2 -3 -4 -3 -1 0 0 1 0 -3 0 0 0 -1 3 0 2 -1 0 1 -1 0 3 2 -1 0 -1 1 0 -1 3 0 2 3 1 1 -1 0 5 2 3 3 1 4 3 -1 0 2 2 4 3 1 3 -1 2 2 3 4 1 2 3 2 1 3 0 3 4 2 3 0 -2 0 1 0 1 -1 0 3 -1 1 -1 -2 0 1 -1 2 CROSSREFS Sequence in context: A098624 A116079 A153445 * A294196 A275794 A037746 Adjacent sequences: A208971 A208972 A208973 * A208975 A208976 A208977 KEYWORD nonn AUTHOR R. H. Hardin, Mar 03 2012 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 March 21 18:35 EDT 2023. Contains 361410 sequences. (Running on oeis4.)