login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A275033 Number of nX4 0..2 arrays with no element equal to any value at offset (0,-1) (-1,-2) or (-2,0) and new values introduced in order 0..2. 1
4, 48, 137, 570, 2334, 9774, 40572, 169348, 704704, 2937764, 12236817, 50996499, 212474695, 885374358, 3689111563, 15371973010, 64051973628, 266893366673, 1112095776824, 4633902454111, 19308634583221, 80455590398414 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A275037.

LINKS

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

FORMULA

Empirical: a(n) = 4*a(n-1) +14*a(n-2) -62*a(n-3) -40*a(n-4) +388*a(n-5) -306*a(n-6) -1193*a(n-7) +2504*a(n-8) +1764*a(n-9) -7620*a(n-10) -1306*a(n-11) +13370*a(n-12) +1805*a(n-13) -16980*a(n-14) -5291*a(n-15) +18277*a(n-16) +10135*a(n-17) -18477*a(n-18) -12333*a(n-19) +18384*a(n-20) +9126*a(n-21) -15323*a(n-22) -4234*a(n-23) +9693*a(n-24) +1188*a(n-25) -4598*a(n-26) -61*a(n-27) +1605*a(n-28) -135*a(n-29) -382*a(n-30) +68*a(n-31) +53*a(n-32) -14*a(n-33) -3*a(n-34) +a(n-35) for n>37

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Cf. A275037.

Sequence in context: A242225 A157818 A048608 * A192418 A162673 A002287

Adjacent sequences:  A275030 A275031 A275032 * A275034 A275035 A275036

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jul 14 2016

STATUS

approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified January 27 22:22 EST 2022. Contains 350654 sequences. (Running on oeis4.)