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A235101 Number of (n+1)X(2+1) 0..6 arrays with every 2X2 subblock having its diagonal sum differing from its antidiagonal sum by 4, with no adjacent elements equal (constant stress tilted 1X1 tilings) 1
670, 2498, 9328, 35354, 135254, 523532, 2047890, 8097130, 32339728, 130423938, 530742334, 2177937580, 9005319178, 37492012258, 157045852768, 661404560282, 2798723937382, 11891816958860, 50708771987330, 216898348529434 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A235107

LINKS

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

FORMULA

Empirical: a(n) = 12*a(n-1) -14*a(n-2) -322*a(n-3) +949*a(n-4) +3384*a(n-5) -12901*a(n-6) -21740*a(n-7) +86236*a(n-8) +107744*a(n-9) -322761*a(n-10) -412538*a(n-11) +641088*a(n-12) +1018740*a(n-13) -478292*a(n-14) -1306432*a(n-15) -247248*a(n-16) +584736*a(n-17) +372096*a(n-18) +65664*a(n-19)

EXAMPLE

Some solutions for n=5

..5..3..2....4..6..4....1..4..6....1..4..6....3..1..3....1..3..6....2..0..2

..0..2..5....3..1..3....4..3..1....3..2..0....4..6..4....6..4..3....3..5..3

..6..4..3....1..3..1....6..1..3....1..4..6....5..3..5....3..5..0....4..2..4

..1..3..6....0..6..0....3..2..0....4..3..1....3..5..3....6..4..3....6..0..6

..6..4..3....3..5..3....6..1..3....6..1..3....0..6..0....3..5..0....5..3..5

..3..5..0....4..2..4....5..4..2....1..0..6....2..4..2....0..6..5....4..6..4

CROSSREFS

Sequence in context: A067875 A224558 A250670 * A232388 A172963 A218795

Adjacent sequences:  A235098 A235099 A235100 * A235102 A235103 A235104

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 03 2014

STATUS

approved

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Last modified January 26 18:26 EST 2022. Contains 350599 sequences. (Running on oeis4.)