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A252136 Number of (n+2)X(5+2) 0..3 arrays with every 3X3 subblock row, column, diagonal and antidiagonal sum not equal to 0 3 4 6 or 7 2
909, 3163, 18047, 96481, 503968, 2670175, 14105069, 74389231, 393421141, 2079994010, 10983498797, 58012068835, 306545373194, 1619740160696, 8557028037752, 45206323422086, 238837210760037, 1261858577287734 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 5 of A252139

LINKS

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

FORMULA

Empirical: a(n) = 2*a(n-1) +2*a(n-2) +39*a(n-3) +181*a(n-4) +262*a(n-5) +238*a(n-6) -1529*a(n-7) -4996*a(n-8) -1940*a(n-9) +5551*a(n-10) +17305*a(n-11) +23836*a(n-12) -26075*a(n-13) -64360*a(n-14) -11102*a(n-15) +51639*a(n-16) +81824*a(n-17) +35975*a(n-18) -53399*a(n-19) -80282*a(n-20) -59920*a(n-21) -23443*a(n-22) +72246*a(n-23) +40762*a(n-24) -1573*a(n-25) +23887*a(n-26) -59858*a(n-27) +34106*a(n-28) -6361*a(n-29) -81*a(n-30) +24130*a(n-31) -31441*a(n-32) +25513*a(n-33) -20671*a(n-34) +14968*a(n-35) -8162*a(n-36) +4626*a(n-37) -2679*a(n-38) +1036*a(n-39) -411*a(n-40) +180*a(n-41) -13*a(n-42) -16*a(n-43) +5*a(n-44) for n>46

EXAMPLE

Some solutions for n=4

..3..3..2..3..3..2..3....3..2..3..3..3..3..2....3..3..3..3..3..2..3

..3..3..3..3..3..3..3....3..3..3..2..3..3..3....3..3..2..3..3..3..3

..3..3..3..3..3..3..3....3..3..3..3..3..2..3....3..3..3..3..2..3..3

..3..3..2..3..3..2..3....3..3..3..3..3..3..3....3..3..3..3..3..3..3

..2..3..3..3..3..3..3....2..3..3..3..3..3..3....3..3..3..3..3..2..3

..3..2..3..3..3..3..2....3..3..3..3..3..3..2....3..3..3..2..3..3..3

CROSSREFS

Sequence in context: A316931 A317702 A214001 * A216930 A332190 A015278

Adjacent sequences:  A252133 A252134 A252135 * A252137 A252138 A252139

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 14 2014

STATUS

approved

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Last modified June 25 16:08 EDT 2022. Contains 354851 sequences. (Running on oeis4.)