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A233787 Number of (n+1)X(3+1) 0..3 arrays with every 2X2 subblock having the sum of the squares of all six edge and diagonal differences equal to 11 1
720, 3932, 20816, 125976, 716768, 4674280, 27765752, 190316292, 1159969064, 8197609072, 50708447672, 364761775656, 2275008360504, 16527758316992, 103549619966920, 756382898620552, 4750510374920744, 34803101628502320 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A233792

LINKS

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

FORMULA

Empirical: a(n) = 139*a(n-2) -7929*a(n-4) +248319*a(n-6) -4798442*a(n-8) +60800038*a(n-10) -523147257*a(n-12) +3118918441*a(n-14) -13016374051*a(n-16) +38139962547*a(n-18) -78218266028*a(n-20) +111158046394*a(n-22) -107387771932*a(n-24) +68279402362*a(n-26) -27119287096*a(n-28) +6185757504*a(n-30) -702040320*a(n-32) +29030400*a(n-34)

EXAMPLE

Some solutions for n=4

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

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

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

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

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

CROSSREFS

Sequence in context: A061299 A167563 A202095 * A280920 A187290 A218487

Adjacent sequences:  A233784 A233785 A233786 * A233788 A233789 A233790

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 15 2013

STATUS

approved

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Last modified December 1 11:36 EST 2021. Contains 349429 sequences. (Running on oeis4.)