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A218590 Hilltop maps: number of nX6 binary arrays indicating the locations of corresponding elements not exceeded by any horizontal or antidiagonal neighbor in a random 0..2 nX6 array 1
49, 3565, 225647, 14313773, 908914463, 57707873919, 3663996495065, 232634494299223, 14770432493750847, 937804521455278797, 59543098444313115311, 3780511282396595054063, 240032277959119287777081 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 6 of A218592

LINKS

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

FORMULA

Empirical: a(n) = 49*a(n-1) +784*a(n-2) +8032*a(n-3) +36736*a(n-4) +128672*a(n-5) +113364*a(n-6) +604540*a(n-7) -442768*a(n-8) +1552544*a(n-9) -2352736*a(n-10) +1296064*a(n-11) -920054*a(n-12) +541894*a(n-13) -439824*a(n-14) +294048*a(n-15) -85440*a(n-16) +68256*a(n-17) -16524*a(n-18) +14652*a(n-19) -9072*a(n-20) +864*a(n-21) -864*a(n-22) -81*a(n-24) +81*a(n-25) for n>27

EXAMPLE

Some solutions for n=3

..0..0..1..1..0..1....0..0..0..0..0..0....0..1..1..0..1..0....0..0..1..0..0..0

..1..0..1..0..1..1....1..1..0..1..0..1....0..1..1..0..1..1....0..0..0..0..1..1

..1..0..0..0..0..0....0..0..0..1..1..0....0..0..0..0..0..1....1..0..0..0..0..1

CROSSREFS

Sequence in context: A014773 A132539 A248167 * A218204 A218231 A219061

Adjacent sequences:  A218587 A218588 A218589 * A218591 A218592 A218593

KEYWORD

nonn

AUTHOR

R. H. Hardin Nov 03 2012

STATUS

approved

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Last modified November 27 01:16 EST 2021. Contains 349344 sequences. (Running on oeis4.)