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!)
A303884 Number of nX4 0..1 arrays with every element unequal to 0, 2, 3 or 4 king-move adjacent elements, with upper left element zero. 2
1, 24, 36, 166, 487, 2130, 7433, 30191, 112815, 444834, 1703258, 6646733, 25671427, 99805187, 386632624, 1501187933, 5821487287, 22593096132, 87646018561, 340100396970, 1319526895683, 5120003868457, 19865539519766, 77080509424841 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 4 of A303888.

LINKS

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

FORMULA

Empirical: a(n) = 5*a(n-1) +9*a(n-2) -64*a(n-3) -24*a(n-4) +324*a(n-5) +29*a(n-6) -908*a(n-7) -26*a(n-8) +1535*a(n-9) -63*a(n-10) -1059*a(n-11) -101*a(n-12) -1818*a(n-13) +615*a(n-14) +8168*a(n-15) +1142*a(n-16) -16297*a(n-17) -9152*a(n-18) +17515*a(n-19) +18762*a(n-20) -6862*a(n-21) -11642*a(n-22) -8527*a(n-23) -8707*a(n-24) +6607*a(n-25) +24394*a(n-26) +7559*a(n-27) -25005*a(n-28) -7899*a(n-29) +7951*a(n-30) +8174*a(n-31) -4288*a(n-32) -1081*a(n-33) +1247*a(n-34) -846*a(n-35) +256*a(n-36) +138*a(n-37) -60*a(n-38) for n>41

EXAMPLE

Some solutions for n=5

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

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

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

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

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

CROSSREFS

Cf. A303888.

Sequence in context: A288949 A108190 A185489 * A304616 A172424 A241286

Adjacent sequences:  A303881 A303882 A303883 * A303885 A303886 A303887

KEYWORD

nonn

AUTHOR

R. H. Hardin, May 02 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 6 17:20 EDT 2020. Contains 334829 sequences. (Running on oeis4.)