A258526 - OEIS

A258526

Number of (n+2)X(4+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

65548, 523452, 3133384, 6505920, 16029944, 49299000, 161983800, 588975448, 2269798888, 8629849032, 35432952680, 139330382536, 579721064488, 2318409734792, 9711197085928, 39208388528968, 164635715673512

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OFFSET

1,1

COMMENTS

Column 4 of A258530

LINKS

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

FORMULA

Empirical: a(n) = 2*a(n-1) +15*a(n-2) -8*a(n-3) -16*a(n-4) -200*a(n-5) +272*a(n-6) -2368*a(n-7) -896*a(n-8) +7808*a(n-9) +39424*a(n-10) +11264*a(n-11) -145408*a(n-12) -114688*a(n-13) +8192*a(n-14) +589824*a(n-15) -393216*a(n-16) for n>25

EXAMPLE

Some solutions for n=1

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

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

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

CROSSREFS

Cf. A258530

Sequence in context: A096555 A362950 A258533 * A254918 A268912 A168667

Adjacent sequences: A258523 A258524 A258525 * A258527 A258528 A258529

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jun 02 2015

STATUS

approved