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

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A232198 Number of (n+1)X(2+1) 0..2 arrays with every element both >= and <= some horizontal, vertical or antidiagonal neighbor 1
109, 2129, 39651, 745157, 14015499, 263553379, 4955798535, 93188421223, 1752307388503, 32950235075335, 619593351859825, 11650779532851601, 219080245401618255, 4119565886810925283, 77463958767778856465 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A232204

LINKS

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

FORMULA

Empirical: a(n) = 22*a(n-1) -75*a(n-2) +344*a(n-3) -1273*a(n-4) +1509*a(n-5) -2550*a(n-6) +39*a(n-7) +29574*a(n-8) -2723*a(n-9) -82741*a(n-10) +9633*a(n-11) -172586*a(n-12) -214133*a(n-13) +806356*a(n-14) +160192*a(n-15) -604578*a(n-16) +485994*a(n-17) -509110*a(n-18) -512043*a(n-19) +1074037*a(n-20) -171816*a(n-21) -641277*a(n-22) +418326*a(n-23) -77850*a(n-24) +15796*a(n-25) +9294*a(n-26) -46219*a(n-27) +38217*a(n-28) -11332*a(n-29) -1277*a(n-30) +4309*a(n-31) -2609*a(n-32) +695*a(n-33) -134*a(n-34) -29*a(n-35) +21*a(n-36) -4*a(n-37) +2*a(n-38) for n>40

EXAMPLE

Some solutions for n=3

..1..1..0....0..2..2....2..2..1....0..0..2....0..2..1....2..2..2....0..0..0

..1..2..0....0..1..2....2..2..0....1..0..2....0..2..0....0..2..1....1..1..2

..2..2..1....2..1..0....0..0..2....1..1..2....0..2..0....0..0..0....1..2..0

..1..1..1....2..0..0....2..2..2....1..1..1....1..1..1....2..2..1....1..2..0

CROSSREFS

Sequence in context: A201849 A061724 A145852 * A232416 A333116 A278278

Adjacent sequences:  A232195 A232196 A232197 * A232199 A232200 A232201

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 20 2013

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.

License Agreements, Terms of Use, Privacy Policy. .

Last modified July 1 10:54 EDT 2022. Contains 354972 sequences. (Running on oeis4.)