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A198509 Number of 2nX4 0..4 arrays with values 0..4 introduced in row major order and each element unequal to exactly two horizontal and vertical neighbors 1
59, 4666, 308854, 23016128, 1768050096, 137433138206, 10767346425686, 846703466364788, 66715358024129644, 5262276771966640650, 415296502306889789762, 32784348340670740616160, 2588447317141729017555864 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A198511

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..179

FORMULA

Empirical: a(n) = 168*a(n-1) -9635*a(n-2) +230508*a(n-3) -1868458*a(n-4) -8029700*a(n-5) -28347702*a(n-6) +7358565368*a(n-7) -118460559973*a(n-8) +848136638992*a(n-9) -2704417624327*a(n-10) -758800108020*a(n-11) +26654251234560*a(n-12) +33477385996812*a(n-13) -778269041202000*a(n-14) +1691040379701264*a(n-15) +5723652909363264*a(n-16) -22555014434827584*a(n-17) -25385900061199616*a(n-18) +137722671189043200*a(n-19) +134897275429925888*a(n-20) -499905738358480896*a(n-21) -804105697954512896*a(n-22) +1173387177266905088*a(n-23) +2723824778237706240*a(n-24) -1319488323495919616*a(n-25) -4574511335676575744*a(n-26) +529114613380284416*a(n-27) +2540311664813670400*a(n-28)

EXAMPLE

Some solutions for n=3

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

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

..2..3..3..4....2..1..1..1....1..3..3..1....1..2..2..3....2..3..3..1

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

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

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

CROSSREFS

Sequence in context: A119886 A135649 A278367 * A258269 A094489 A235215

Adjacent sequences:  A198506 A198507 A198508 * A198510 A198511 A198512

KEYWORD

nonn

AUTHOR

R. H. Hardin Oct 25 2011

STATUS

approved

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Last modified January 28 12:58 EST 2020. Contains 331321 sequences. (Running on oeis4.)