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A258531 Number of (2+2)X(n+2) 0..1 arrays with every 3X3 subblock sum of the two maximums of the central row and central column plus the two minimums of the diagonal and antidiagonal nondecreasing horizontally, vertically and ne-to-sw antidiagonally 1
2812, 16473, 92996, 523452, 2927601, 16010949, 85453855, 448125325, 2326571244, 11996536932, 61495715332, 313646814384, 1593373696637, 8068674263131, 40750069662431, 205333266186277, 1032626222703852, 5184491602652610 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Row 2 of A258530
LINKS
FORMULA
Empirical: a(n) = 10*a(n-1) -19*a(n-2) -74*a(n-3) +257*a(n-4) -222*a(n-5) -127*a(n-6) +1310*a(n-7) +5707*a(n-8) -19034*a(n-9) -42452*a(n-10) +94264*a(n-11) +92763*a(n-12) -76114*a(n-13) -25411*a(n-14) -417498*a(n-15) -322268*a(n-16) +880868*a(n-17) +861164*a(n-18) +190524*a(n-19) -942038*a(n-20) -1632564*a(n-21) -76455*a(n-22) -316746*a(n-23) +1435863*a(n-24) +3277486*a(n-25) -886992*a(n-26) -811984*a(n-27) -1316853*a(n-28) -3598154*a(n-29) +730003*a(n-30) +2935906*a(n-31) +2403955*a(n-32) +102238*a(n-33) -2209317*a(n-34) -1258874*a(n-35) -669825*a(n-36) +1040078*a(n-37) +1511094*a(n-38) -443868*a(n-39) -672040*a(n-40) +29952*a(n-41) +138128*a(n-42) +26784*a(n-43) -15520*a(n-44) -4544*a(n-45) +384*a(n-46) +256*a(n-47) for n>52
EXAMPLE
Some solutions for n=3
..0..0..1..1..1....0..1..0..1..0....1..1..1..1..0....1..1..1..1..0
..0..1..0..0..1....0..0..0..1..1....1..0..0..1..1....0..1..0..0..1
..0..0..1..1..1....1..1..0..0..1....0..1..1..1..0....0..1..0..1..0
..1..0..1..1..0....0..0..1..1..0....0..1..1..0..0....0..0..1..0..0
CROSSREFS
Sequence in context: A254254 A254261 A258524 * A254300 A254916 A107533
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jun 02 2015
STATUS
approved

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Last modified February 23 08:34 EST 2024. Contains 370272 sequences. (Running on oeis4.)