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A235242 Number of (n+1)X(2+1) 0..7 arrays with every 2X2 subblock having its diagonal sum differing from its antidiagonal sum by 6, with no adjacent elements equal (constant stress tilted 1X1 tilings) 1
906, 3146, 10866, 41246, 152178, 599342, 2282514, 9184758, 35696098, 145885710, 575507682, 2380818854, 9501151026, 39692769950, 159843012210, 673129281462, 2730115908610, 11572454510574, 47201672364546, 201156697569350 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A235248

LINKS

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

FORMULA

Empirical: a(n) = 10*a(n-1) +74*a(n-2) -1028*a(n-3) -1552*a(n-4) +46036*a(n-5) -24442*a(n-6) -1177460*a(n-7) +1943623*a(n-8) +18929582*a(n-9) -46678364*a(n-10) -197883208*a(n-11) +641672504*a(n-12) +1336005112*a(n-13) -5669843140*a(n-14) -5468829608*a(n-15) +33406180141*a(n-16) +10415153798*a(n-17) -132321704558*a(n-18) +11352730700*a(n-19) +350059155896*a(n-20) -111967629644*a(n-21) -608429901490*a(n-22) +262134791548*a(n-23) +679376121053*a(n-24) -292943901086*a(n-25) -478176518752*a(n-26) +156339289216*a(n-27) +209957565216*a(n-28) -34929735168*a(n-29) -53104170864*a(n-30) +1188145056*a(n-31) +6857059248*a(n-32) +568465632*a(n-33) -342553536*a(n-34) -52700544*a(n-35)

EXAMPLE

Some solutions for n=4

..1..5..1....2..4..2....2..4..1....2..4..2....6..7..6....2..3..2....7..3..4

..2..0..2....6..2..6....5..1..4....7..3..7....5..0..5....6..1..6....3..5..0

..0..4..0....3..5..3....1..3..0....2..4..2....1..2..1....3..4..3....7..3..4

..3..1..3....7..3..7....4..0..3....5..1..5....6..1..6....7..2..7....5..7..2

..2..6..2....5..7..5....2..4..1....3..5..3....3..4..3....6..7..6....4..0..1

CROSSREFS

Sequence in context: A330284 A330303 A181257 * A270446 A006917 A174862

Adjacent sequences:  A235239 A235240 A235241 * A235243 A235244 A235245

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 05 2014

STATUS

approved

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Last modified October 27 09:30 EDT 2021. Contains 348272 sequences. (Running on oeis4.)