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!)
A254991 Number of (n+2)X(1+2) 0..1 arrays with every 3X3 subblock sum of the two medians of the diagonal and antidiagonal minus the sum of the medians of the central row and column nondecreasing horizontally and vertically 2
512, 2679, 10762, 44548, 193488, 827673, 3456356, 14347670, 59706588, 248566303, 1033130316, 4290307069, 17817336950, 74000251757, 307313144732, 1276118644644, 5299027913826, 22004176592350, 91371821842232 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 1 of A254998

LINKS

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

FORMULA

Empirical: a(n) = 8*a(n-1) -23*a(n-2) +44*a(n-3) -66*a(n-4) -8*a(n-5) +140*a(n-6) -330*a(n-7) +1242*a(n-8) -2238*a(n-9) +3095*a(n-10) -3686*a(n-11) +800*a(n-12) +3024*a(n-13) -10566*a(n-14) +29630*a(n-15) -49344*a(n-16) +46186*a(n-17) -50188*a(n-18) +48446*a(n-19) +15531*a(n-20) -117740*a(n-21) +178416*a(n-22) -218922*a(n-23) +361814*a(n-24) -321718*a(n-25) +46758*a(n-26) +27060*a(n-27) -20770*a(n-28) +400582*a(n-29) -819637*a(n-30) +440604*a(n-31) +150305*a(n-32) +416494*a(n-33) -832954*a(n-34) -170232*a(n-35) +836549*a(n-36) +137570*a(n-37) -854341*a(n-38) -351998*a(n-39) +1162124*a(n-40) +31976*a(n-41) -958036*a(n-42) +16048*a(n-43) +573824*a(n-44) -177168*a(n-45) -427248*a(n-46) +99264*a(n-47) +163584*a(n-48) -13824*a(n-49) -20736*a(n-50) for n>54

EXAMPLE

Some solutions for n=4

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

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

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

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

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

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

CROSSREFS

Cf. A254998

Sequence in context: A254982 A258511 A254998 * A186840 A224643 A186832

Adjacent sequences:  A254988 A254989 A254990 * A254992 A254993 A254994

KEYWORD

nonn

AUTHOR

R. H. Hardin, Feb 11 2015

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 September 23 19:03 EDT 2021. Contains 347617 sequences. (Running on oeis4.)