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!)
A257148 Number of (n+2)X(2+2) 0..1 arrays with every 3X3 subblock sum of the two medians of the central row and column minus the sum of the minimums of the diagonal and antidiagonal nondecreasing horizontally, vertically and ne-to-sw antidiagonally 1
2848, 16677, 101227, 594229, 3374539, 19028310, 106805258, 596053900, 3313202232, 18364278500, 101563966487, 560710638830, 3091513270239, 17027829457467, 93715212546183, 515462743205034, 2833901320808390 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A257154

LINKS

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

FORMULA

Empirical: a(n) = 9*a(n-1) -14*a(n-2) -32*a(n-3) +120*a(n-4) -1172*a(n-5) +3932*a(n-6) -6280*a(n-7) +19737*a(n-8) -12753*a(n-9) -31142*a(n-10) +10820*a(n-11) -324465*a(n-12) +244165*a(n-13) +487033*a(n-14) +676647*a(n-15) +2800415*a(n-16) -1508929*a(n-17) -11016270*a(n-18) -1321986*a(n-19) -19384745*a(n-20) +29741253*a(n-21) +65612097*a(n-22) +30108231*a(n-23) -132843037*a(n-24) +1221523*a(n-25) -217403908*a(n-26) +39811528*a(n-27) +1191428040*a(n-28) -1237901696*a(n-29) -725097232*a(n-30) +1861412656*a(n-31) -1356213568*a(n-32) +572751872*a(n-33) +971675648*a(n-34) -1887011840*a(n-35) +520824832*a(n-36) +413429760*a(n-37) -34947072*a(n-38) +44400640*a(n-39) -256638976*a(n-40) +222035968*a(n-41) -49283072*a(n-42) -88080384*a(n-43) +50331648*a(n-44) for n>50

EXAMPLE

Some solutions for n=3

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

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

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

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

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

CROSSREFS

Cf. A257154

Sequence in context: A317472 A317473 A257155 * A254737 A234416 A218597

Adjacent sequences:  A257145 A257146 A257147 * A257149 A257150 A257151

KEYWORD

nonn

AUTHOR

R. H. Hardin, Apr 16 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 November 29 13:17 EST 2021. Contains 349416 sequences. (Running on oeis4.)