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A252340 Number of (n+2)X(5+2) 0..2 arrays with every 3X3 subblock row, column, diagonal and antidiagonal sum not equal to 2 3 or 4 1
1202, 6030, 34894, 184434, 960912, 5095514, 26921266, 142055830, 751350674, 3970616096, 20965518986, 110757703254, 585288671536, 3092324660540, 16336190695884, 86305670639244, 455983026741470, 2409093456126340 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 5 of A252343

LINKS

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

FORMULA

Empirical: a(n) = a(n-1) +3*a(n-2) +42*a(n-3) +223*a(n-4) +485*a(n-5) +723*a(n-6) -806*a(n-7) -5802*a(n-8) -7742*a(n-9) -2191*a(n-10) +15114*a(n-11) +38950*a(n-12) +12875*a(n-13) -51485*a(n-14) -62587*a(n-15) -10948*a(n-16) +70876*a(n-17) +106851*a(n-18) +53452*a(n-19) -26830*a(n-20) -86750*a(n-21) -110193*a(n-22) -37947*a(n-23) +2815*a(n-24) +1242*a(n-25) +25129*a(n-26) -34729*a(n-27) -623*a(n-28) -6984*a(n-29) -7065*a(n-30) +17065*a(n-31) -14376*a(n-32) +11137*a(n-33) -9534*a(n-34) +5434*a(n-35) -2728*a(n-36) +1898*a(n-37) -781*a(n-38) +255*a(n-39) -156*a(n-40) +24*a(n-41) +11*a(n-42) -5*a(n-43) for n>45

EXAMPLE

Some solutions for n=4

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

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

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

..0..0..0..0..0..0..0....0..0..0..0..0..0..0....0..0..0..0..0..0..0

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

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

CROSSREFS

Sequence in context: A221451 A133142 A068534 * A230838 A210015 A259521

Adjacent sequences:  A252337 A252338 A252339 * A252341 A252342 A252343

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 16 2014

STATUS

approved

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Last modified May 18 23:08 EDT 2021. Contains 344008 sequences. (Running on oeis4.)