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A233812 Number of (n+1)X(2+1) 0..5 arrays with every 2X2 subblock having the sum of the squares of all six edge and diagonal differences equal to 11 1
428, 2216, 10972, 59164, 301132, 1671748, 8669484, 49193332, 258472076, 1489731188, 7897386348, 46003922580, 245314826316, 1439035206612, 7702769372076, 45388322272500, 243536496830348, 1439109535539508 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A233818

LINKS

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

FORMULA

Empirical: a(n) = 5*a(n-1) +74*a(n-2) -386*a(n-3) -1919*a(n-4) +10855*a(n-5) +21122*a(n-6) -141906*a(n-7) -86736*a(n-8) +918488*a(n-9) -46708*a(n-10) -2918256*a(n-11) +1088816*a(n-12) +4381664*a(n-13) -2361152*a(n-14) -2591360*a(n-15) +1642176*a(n-16) +224256*a(n-17) -168192*a(n-18)

EXAMPLE

Some solutions for n=4

..5..5..3....3..1..3....5..4..2....4..2..4....5..4..2....2..1..0....3..2..3

..3..4..5....2..1..2....3..3..2....2..3..2....5..3..2....0..0..2....4..4..2

..5..5..3....0..0..2....1..2..4....2..4..2....4..3..1....2..1..2....2..3..2

..3..4..3....1..2..1....1..3..4....3..4..3....2..2..3....3..3..3....3..1..3

..2..2..4....3..3..3....1..2..2....2..2..2....4..3..1....5..4..5....1..2..1

CROSSREFS

Sequence in context: A030467 A253505 A173798 * A231047 A177328 A243833

Adjacent sequences:  A233809 A233810 A233811 * A233813 A233814 A233815

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 16 2013

STATUS

approved

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Last modified November 15 18:59 EST 2019. Contains 329149 sequences. (Running on oeis4.)