login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo

Please make a donation to keep the OEIS running. We are now in our 56th year. In the past year we added 10000 new sequences and reached almost 9000 citations (which often say "discovered thanks to the OEIS").
Other ways to donate

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A220717 Number of ways to reciprocally link elements of an nX6 array either to themselves or to exactly two king-move neighbors, without consecutive collinear links 1
1, 1930, 201598, 63806966, 14158198781, 3503850286857, 837962999003819, 202559596688263771, 48800208840366180607, 11769507869511009093649, 2837567849598052498110938, 684198360972218804926155379 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 6 of A220718

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..31

EXAMPLE

Some solutions for n=3 0=self 1=nw 2=n 3=ne 4=w 6=e 7=sw 8=s 9=se (reciprocal directions total 10)

.00.00.68.48.00.78...00.67.48.68.49.00...00.68.49.79.79.00...00.69.49.00.78.00

.69.48.29.27.36.24...36.48.27.27.67.14...00.26.34.13.18.17...00.79.17.13.27.78

.00.12.36.14.00.00...00.23.36.34.00.00...00.00.00.00.23.00...36.34.16.34.36.24

CROSSREFS

Sequence in context: A253337 A200435 A252108 * A162386 A283925 A166393

Adjacent sequences:  A220714 A220715 A220716 * A220718 A220719 A220720

KEYWORD

nonn

AUTHOR

R. H. Hardin Dec 18 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 | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified December 2 08:18 EST 2020. Contains 338868 sequences. (Running on oeis4.)