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A235237 Number of (n+1)X(6+1) 0..6 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
52468, 113940, 241456, 580668, 1355796, 3512000, 8787924, 24042932, 63316120, 180522036, 494486652, 1455378584, 4114134172, 12414572220, 36016421984, 110870253196, 328752504052, 1028636278080, 3107701982004, 9857358757940 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 6 of A235239

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..71

FORMULA

Empirical: a(n) = 7*a(n-1) +69*a(n-2) -574*a(n-3) -1978*a(n-4) +21370*a(n-5) +27951*a(n-6) -478485*a(n-7) -113003*a(n-8) +7195152*a(n-9) -2958344*a(n-10) -76861940*a(n-11) +65204416*a(n-12) +601876824*a(n-13) -702665742*a(n-14) -3516184990*a(n-15) +4973786477*a(n-16) +15464027179*a(n-17) -24964585223*a(n-18) -51381565162*a(n-19) +91429360722*a(n-20) +129074199158*a(n-21) -246783610545*a(n-22) -245370073973*a(n-23) +491176690303*a(n-24) +354658110454*a(n-25) -717262274054*a(n-26) -393919013804*a(n-27) +761914551864*a(n-28) +340116859488*a(n-29) -581525075904*a(n-30) -227924908368*a(n-31) +312863061744*a(n-32) +115489716768*a(n-33) -114941096928*a(n-34) -42030498240*a(n-35) +27265994496*a(n-36) +10170800640*a(n-37) -3740567040*a(n-38) -1442479104*a(n-39) +223948800*a(n-40) +89579520*a(n-41)

EXAMPLE

Some solutions for n=2

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

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

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

CROSSREFS

Sequence in context: A107654 A015359 A263123 * A237138 A201268 A200658

Adjacent sequences:  A235234 A235235 A235236 * A235238 A235239 A235240

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 05 2014

STATUS

approved

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Last modified June 12 08:13 EDT 2021. Contains 344943 sequences. (Running on oeis4.)