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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A305093 Number of nX4 0..1 arrays with every element unequal to 1, 2, 4, 6 or 7 king-move adjacent elements, with upper left element zero. 1
2, 10, 17, 20, 37, 142, 295, 459, 1201, 3140, 5679, 11961, 30760, 65672, 131365, 307549, 703252, 1466918, 3214273, 7362021, 16026098, 34540558, 77372285, 171866728, 373246320, 822381926, 1829780399, 4016363100, 8804567379 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A305097.

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..210

FORMULA

Empirical: a(n) = a(n-1) +4*a(n-2) +8*a(n-3) -5*a(n-4) -41*a(n-5) -51*a(n-6) +18*a(n-7) +129*a(n-8) +150*a(n-9) +84*a(n-10) +28*a(n-11) -181*a(n-12) -565*a(n-13) -531*a(n-14) +108*a(n-15) +151*a(n-16) -535*a(n-17) +219*a(n-18) +2126*a(n-19) +2203*a(n-20) -1637*a(n-21) -1492*a(n-22) +1388*a(n-23) +2081*a(n-24) +3836*a(n-25) +4471*a(n-26) +4944*a(n-27) -15416*a(n-28) -19801*a(n-29) -10113*a(n-30) -9394*a(n-31) +7*a(n-32) +3731*a(n-33) +13760*a(n-34) -10419*a(n-35) +27310*a(n-36) +52883*a(n-37) +22041*a(n-38) -6115*a(n-39) -809*a(n-40) +20488*a(n-41) -42320*a(n-42) -30422*a(n-43) -9010*a(n-44) -3526*a(n-45) -15159*a(n-46) -9972*a(n-47) +20205*a(n-48) +2987*a(n-49) +3492*a(n-50) -6258*a(n-51) +373*a(n-52) -7508*a(n-53) +1019*a(n-54) +6434*a(n-55) +4843*a(n-56) +2977*a(n-57) +1648*a(n-58) +1235*a(n-59) -1177*a(n-60) -1220*a(n-61) -998*a(n-62) -406*a(n-63) -95*a(n-64) +46*a(n-65) +67*a(n-66) +28*a(n-67) +28*a(n-68) +15*a(n-69) +3*a(n-70) -4*a(n-71) for n>72

EXAMPLE

Some solutions for n=5

..0..0..0..1. .0..0..0..0. .0..1..0..1. .0..1..1..0. .0..1..0..1

..0..1..1..1. .0..1..1..0. .0..1..0..1. .0..0..0..0. .0..0..1..1

..1..0..0..1. .0..0..0..0. .1..1..1..1. .0..0..0..0. .0..1..1..1

..1..1..1..0. .0..1..1..0. .0..1..0..1. .0..1..0..1. .0..1..1..0

..1..0..0..0. .0..0..0..0. .0..1..0..1. .0..1..0..1. .1..1..1..0

CROSSREFS

Cf. A305097.

Sequence in context: A276046 A268481 A009387 * A316753 A304809 A304805

Adjacent sequences:  A305090 A305091 A305092 * A305094 A305095 A305096

KEYWORD

nonn

AUTHOR

R. H. Hardin, May 25 2018

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 June 17 05:41 EDT 2021. Contains 345080 sequences. (Running on oeis4.)