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A235306 Number of (n+1)X(4+1) 0..5 arrays with every 2X2 subblock having its diagonal sum differing from its antidiagonal sum by 6 (constant stress 1X1 tilings) 1
1554, 2918, 5042, 10790, 21090, 49574, 107186, 269222, 629154, 1656998, 4101362, 11181350, 28857570, 80708774, 214757426, 612173222, 1666192674, 4817289638, 13336967282, 38965654310, 109297879650, 321784561574, 911836050866 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A235310

LINKS

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

FORMULA

Empirical: a(n) = 4*a(n-1) +25*a(n-2) -112*a(n-3) -231*a(n-4) +1260*a(n-5) +875*a(n-6) -7280*a(n-7) -224*a(n-8) +22736*a(n-9) -7980*a(n-10) -36288*a(n-11) +21456*a(n-12) +23040*a(n-13) -17280*a(n-14)

EXAMPLE

Some solutions for n=5

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

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

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

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

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

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

CROSSREFS

Sequence in context: A252046 A252045 A184683 * A203501 A229434 A022222

Adjacent sequences:  A235303 A235304 A235305 * A235307 A235308 A235309

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 05 2014

STATUS

approved

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Last modified January 27 22:32 EST 2022. Contains 350654 sequences. (Running on oeis4.)