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A235235 Number of (n+1)X(4+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
4652, 11728, 28400, 77368, 201676, 580668, 1593940, 4773744, 13619216, 41986384, 123455548, 389051892, 1172319572, 3758507320, 11558458656, 37574720456, 117559819820, 386585266780, 1227444437620, 4075831706064, 13106397783216 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A235239

LINKS

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

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=4

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

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

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

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

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

CROSSREFS

Sequence in context: A028551 A031615 A122713 * A118815 A235183 A069646

Adjacent sequences:  A235232 A235233 A235234 * A235236 A235237 A235238

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 05 2014

STATUS

approved

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Last modified June 18 06:02 EDT 2021. Contains 345098 sequences. (Running on oeis4.)