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A252470 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 5 6 or 8 1
4507, 3497, 18175, 96543, 504030, 2670237, 14105131, 74389293, 393421203, 2079994072, 10983498859, 58012068897, 306545373256, 1619740160758, 8557028037814, 45206323422148, 238837210760099, 1261858577287796 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 5 of A252473

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>47

EXAMPLE

Some solutions for n=4

..3..3..3..3..3..1..3....1..3..3..3..3..3..1....3..3..3..3..3..1..3

..3..3..1..3..3..3..3....3..3..3..1..3..3..3....3..3..3..3..3..3..3

..3..3..3..3..3..3..1....3..3..3..3..3..3..3....1..3..3..3..3..3..1

..3..1..3..3..3..3..3....3..3..3..3..3..3..3....3..3..1..3..3..3..3

..3..3..3..1..3..3..3....1..3..3..3..3..3..3....3..3..3..3..3..3..3

..1..3..3..3..3..3..3....3..3..3..1..3..3..3....3..3..3..1..3..3..1

CROSSREFS

Sequence in context: A225625 A184465 A144490 * A252628 A252623 A023684

Adjacent sequences:  A252467 A252468 A252469 * A252471 A252472 A252473

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 17 2014

STATUS

approved

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Last modified July 2 10:39 EDT 2022. Contains 355004 sequences. (Running on oeis4.)