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A250977 Number of (n+1)X(3+1) 0..2 arrays with no 2X2 subblock having the sum of its diagonal elements less than the absolute difference of its antidiagonal elements 1
4459, 260056, 15156945, 883387252, 51487962431, 3000977166321, 174911850250602, 10194729848690817, 594199424464797450, 34632890029684972761, 2018576627576734108787, 117652658998515320537660 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A250982

LINKS

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

FORMULA

Empirical: a(n) = 81*a(n-1) -1684*a(n-2) +25348*a(n-3) -291723*a(n-4) +2424044*a(n-5) -15158818*a(n-6) +72317084*a(n-7) -255573416*a(n-8) +577878414*a(n-9) -163185020*a(n-10) -5109887649*a(n-11) +25157774093*a(n-12) -71367808333*a(n-13) +137995625151*a(n-14) -181844817574*a(n-15) +136162696861*a(n-16) +29883755630*a(n-17) -265402122592*a(n-18) +470072312498*a(n-19) -567382408955*a(n-20) +541266269549*a(n-21) -424227412036*a(n-22) +271877339590*a(n-23) -139592889535*a(n-24) +56061838432*a(n-25) -16978905986*a(n-26) +3547582620*a(n-27) -264772260*a(n-28) -77711536*a(n-29) +18671292*a(n-30) -1409504*a(n-31) -189020*a(n-32) +74448*a(n-33) +960*a(n-34)

EXAMPLE

Some solutions for n=1

..2..0..1..2....1..2..2..1....1..2..2..1....2..0..1..0....1..0..2..1

..2..0..1..1....2..2..2..0....1..0..2..2....2..1..0..2....1..1..1..1

CROSSREFS

Sequence in context: A235015 A185767 A089202 * A289513 A345590 A345848

Adjacent sequences:  A250974 A250975 A250976 * A250978 A250979 A250980

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 29 2014

STATUS

approved

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Last modified November 28 12:44 EST 2021. Contains 349403 sequences. (Running on oeis4.)