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A251396 Number of (n+1)X(2+1) 0..3 arrays with no 2X2 subblock having the sum of its diagonal elements less than the absolute difference of its antidiagonal elements 1
3205, 165498, 8558283, 442476530, 22875877611, 1182680672547, 61144538351375, 3161169623507538, 163432309835512202, 8449442177310959014, 436835734777161324276, 22584385473987175705646, 1167611590864504600763952 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A251402

LINKS

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

FORMULA

Empirical: a(n) = 64*a(n-1) -765*a(n-2) +7612*a(n-3) -52441*a(n-4) +214718*a(n-5) -593810*a(n-6) +1025324*a(n-7) -199793*a(n-8) -5621360*a(n-9) +22779258*a(n-10) -54455283*a(n-11) +92144141*a(n-12) -114989494*a(n-13) +108478582*a(n-14) -77963792*a(n-15) +41298509*a(n-16) -14996935*a(n-17) +2763273*a(n-18) +672602*a(n-19) -778511*a(n-20) +318339*a(n-21) -73291*a(n-22) +9681*a(n-23) -693*a(n-24) +25*a(n-25)

EXAMPLE

Some solutions for n=2

..2..2..1....0..1..1....0..3..0....2..3..1....2..2..2....0..3..0....1..2..0

..2..2..3....1..0..0....3..1..3....2..3..0....0..0..2....3..0..0....0..3..2

..1..0..2....2..1..2....2..3..2....3..2..3....2..3..1....3..0..1....1..3..0

CROSSREFS

Sequence in context: A212074 A023308 A171350 * A054036 A236252 A232262

Adjacent sequences:  A251393 A251394 A251395 * A251397 A251398 A251399

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 02 2014

STATUS

approved

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Last modified August 16 00:08 EDT 2022. Contains 356150 sequences. (Running on oeis4.)