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A234698 Number of (n+1)X(2+1) 0..7 arrays with every 2X2 subblock having its diagonal sum differing from its antidiagonal sum by 5 (constant stress 1X1 tilings) 1
2628, 13952, 74308, 409268, 2261220, 12903164, 73793620, 434990348, 2565773508, 15562814252, 94270091668, 585903611948, 3628952476740, 23018623628204, 145209752122900, 936710697140588, 5998159579778628, 39231903137940332 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A234702

LINKS

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

FORMULA

Empirical: a(n) = 15*a(n-1) +125*a(n-2) -2865*a(n-3) -1490*a(n-4) +219360*a(n-5) -507740*a(n-6) -8437740*a(n-7) +34905816*a(n-8) +161734320*a(n-9) -1006299360*a(n-10) -1062547200*a(n-11) +13887417600*a(n-12) -8926848000*a(n-13) -75188736000*a(n-14) +121927680000*a(n-15)

EXAMPLE

Some solutions for n=3

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

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

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

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

CROSSREFS

Sequence in context: A295482 A236621 A221941 * A190936 A020439 A254776

Adjacent sequences:  A234695 A234696 A234697 * A234699 A234700 A234701

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 29 2013

STATUS

approved

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Last modified January 16 13:57 EST 2022. Contains 350376 sequences. (Running on oeis4.)