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A206118 T(n,k) = number of (n+1) X (k+1) 0..3 arrays with every 2 X 3 or 3 X 2 subblock having exactly two counterclockwise and two clockwise edge increases. 9
256, 1140, 1140, 6028, 5228, 6028, 31756, 22624, 22624, 31756, 171564, 111552, 88596, 111552, 171564, 973388, 588840, 520800, 520800, 588840, 973388, 5538732, 3048096, 2408480, 5048352, 2408480, 3048096, 5538732, 31668844, 16072760 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Table starts

......256.....1140......6028......31756.......171564........973388

.....1140.....5228.....22624.....111552.......588840.......3048096

.....6028....22624.....88596.....520800......2408480......10792800

....31756...111552....520800....5048352.....21702240.....157206240

...171564...588840...2408480...21702240....190349280....1990281312

...973388..3048096..10792800..157206240...1990281312...24408220320

..5538732.16072760..59892000.1542266208..18371031840..373319837280

.31668844.84203240.276975200.6705992160.163028308320.4839970998240

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..364

FORMULA

Empirical for row k:

k=1: a(n) = 5*a(n-1) + 5*a(n-2) + 29*a(n-3) - 142*a(n-4) - 248*a(n-5) + 88*a(n-6) + 144*a(n-7).

k=2: a(n) = 2*a(n-1) + 19*a(n-2) + 6*a(n-3) - 90*a(n-4) + 19*a(n-5) + 45*a(n-6) for n>8.

k=3: a(n) = 115*a(n-3) for n>6.

k=4: a(n) = 309*a(n-3) for n>7.

k=5: a(n) = 859*a(n-3) for n>8.

k=6: a(n) = 2445*a(n-3) for n>9.

k=7: a(n) = 7075*a(n-3) for n>10.

k=8: a(n) = 20709*a(n-3) for n>11.

k=9: a(n) = 61099*a(n-3) for n>12.

k=10: a(n) = 181245*a(n-3) for n>13.

Apparently, a(n) = A183624(k)*a(n-3) for k>2 and n>k+3

EXAMPLE

Some solutions for n=4, k=3:

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

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

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

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

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

CROSSREFS

Sequence in context: A237688 A237299 A237293 * A206111 A237211 A237204

Adjacent sequences:  A206115 A206116 A206117 * A206119 A206120 A206121

KEYWORD

nonn,tabl

AUTHOR

R. H. Hardin, Feb 03 2012

STATUS

approved

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Last modified January 19 09:28 EST 2020. Contains 331048 sequences. (Running on oeis4.)