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A235314 Number of (n+1)X(3+1) 0..6 arrays with every 2X2 subblock having its diagonal sum differing from its antidiagonal sum by 7 (constant stress 1X1 tilings) 1
1120, 2744, 5968, 16352, 40144, 118160, 316912, 978320, 2793040, 8912144, 26587888, 86877392, 267503824, 889483280, 2803453552, 9443848400, 30295673680, 103054014224, 335138253808, 1148358087632, 3774606372304, 13004580227600 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A235319

LINKS

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

FORMULA

Empirical: a(n) = 4*a(n-1) +47*a(n-2) -200*a(n-3) -901*a(n-4) +4204*a(n-5) +8957*a(n-6) -48440*a(n-7) -47194*a(n-8) +334096*a(n-9) +101948*a(n-10) -1410080*a(n-11) +170136*a(n-12) +3549696*a(n-13) -1446912*a(n-14) -4861440*a(n-15) +2954880*a(n-16) +2764800*a(n-17) -2073600*a(n-18)

EXAMPLE

Some solutions for n=4

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

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

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

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

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

CROSSREFS

Sequence in context: A134211 A171004 A235275 * A237689 A032777 A234445

Adjacent sequences:  A235311 A235312 A235313 * A235315 A235316 A235317

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 05 2014

STATUS

approved

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Last modified January 19 01:11 EST 2021. Contains 340262 sequences. (Running on oeis4.)