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A232671 Number of (n+1)X(2+1) 0..2 arrays with every element next to itself plus and minus one within the range 0..2 horizontally, vertically, diagonally or antidiagonally 1
212, 3138, 63632, 1323984, 26350948, 532378308, 10773984656, 217145249724, 4384228816944, 88517485617660, 1786475659945216, 36062434969543892, 727952626349243712, 14693874074841954556, 296605736453181963248 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A232677

LINKS

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

FORMULA

Empirical: a(n) = 7*a(n-1) +143*a(n-2) +2259*a(n-3) +4937*a(n-4) +537*a(n-5) -135233*a(n-6) -381639*a(n-7) -575862*a(n-8) +1562236*a(n-9) +4517962*a(n-10) +3839040*a(n-11) -6466486*a(n-12) -13678168*a(n-13) +2830292*a(n-14) +12543416*a(n-15) +501152*a(n-16) -3876392*a(n-17) -3294920*a(n-18) +1863872*a(n-19) -369088*a(n-20) +655936*a(n-21) -7552*a(n-22) -67328*a(n-23) -22528*a(n-24) +8192*a(n-25)

EXAMPLE

Some solutions for n=3

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

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

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

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

CROSSREFS

Sequence in context: A114880 A200433 A222950 * A082828 A254704 A267062

Adjacent sequences:  A232668 A232669 A232670 * A232672 A232673 A232674

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 27 2013

STATUS

approved

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Last modified September 22 06:01 EDT 2021. Contains 347605 sequences. (Running on oeis4.)