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A235094 Number of (n+1)X(4+1) 0..5 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
2580, 4820, 9460, 21264, 48844, 121768, 306532, 813576, 2175660, 6047320, 16929348, 48865480, 141911020, 422528408, 1263337092, 3855011816, 11785843980, 36637377848, 113858844484, 358743669288, 1127952290764, 3587979285400 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A235098

LINKS

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

FORMULA

Empirical: a(n) = 9*a(n-1) +6*a(n-2) -279*a(n-3) +514*a(n-4) +3213*a(n-5) -10656*a(n-6) -15267*a(n-7) +92760*a(n-8) +195*a(n-9) -435144*a(n-10) +318243*a(n-11) +1151658*a(n-12) -1467393*a(n-13) -1629840*a(n-14) +3140943*a(n-15) +944545*a(n-16) -3513288*a(n-17) +172122*a(n-18) +2004312*a(n-19) -330148*a(n-20) -568464*a(n-21) +76440*a(n-22) +65520*a(n-23)

EXAMPLE

Some solutions for n=4

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

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

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

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

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

CROSSREFS

Sequence in context: A034415 A201510 A303400 * A171257 A252159 A252167

Adjacent sequences:  A235091 A235092 A235093 * A235095 A235096 A235097

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 03 2014

STATUS

approved

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Last modified August 10 19:52 EDT 2020. Contains 336381 sequences. (Running on oeis4.)