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A250614 Number of (n+1)X(2+1) 0..2 arrays with nondecreasing maximum of every two consecutive values in every row and column 1
484, 6166, 71610, 712806, 6676967, 58739370, 498574034, 4101893438, 33038787862, 261517579086, 2043438617499, 15800948435480, 121191402790490, 923419195908856, 6998991639322528, 52820352377908192, 397229610123962169 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A250620

LINKS

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

FORMULA

Empirical: a(n) = 20*a(n-1) -58*a(n-2) -1211*a(n-3) +7469*a(n-4) +29122*a(n-5) -286876*a(n-6) -311695*a(n-7) +6140380*a(n-8) -7690*a(n-9) -85918626*a(n-10) +44759888*a(n-11) +844728807*a(n-12) -655827274*a(n-13) -6063710214*a(n-14) +5375423069*a(n-15) +32445046521*a(n-16) -29581330770*a(n-17) -130679364110*a(n-18) +116147189109*a(n-19) +397073668236*a(n-20) -334338976080*a(n-21) -906794930412*a(n-22) +714243886032*a(n-23) +1542177478836*a(n-24) -1135140360464*a(n-25) -1924004585304*a(n-26) +1333380426408*a(n-27) +1721585725960*a(n-28) -1138046392224*a(n-29) -1068613653344*a(n-30) +684393855872*a(n-31) +437511683328*a(n-32) -275803776512*a(n-33) -109021933056*a(n-34) +68686921728*a(n-35) +14320318464*a(n-36) -9177366528*a(n-37) -700416000*a(n-38) +471859200*a(n-39)

EXAMPLE

Some solutions for n=3

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

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

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

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

CROSSREFS

Sequence in context: A236647 A237078 A085120 * A234780 A013771 A114774

Adjacent sequences:  A250611 A250612 A250613 * A250615 A250616 A250617

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 26 2014

STATUS

approved

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Last modified September 16 06:38 EDT 2019. Contains 327090 sequences. (Running on oeis4.)