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!)
A269824 Number of nX3 0..4 arrays with some element plus some horizontally, diagonally, antidiagonally or vertically adjacent neighbor totalling four exactly once. 1
40, 3096, 103296, 3200604, 90748696, 2472983556, 65284613232, 1686961414812, 42866673833128, 1075244105809044, 26689182058679264, 656784781178376396, 16046367933842361752, 389645465813128015044, 9411830636459978769552 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 3 of A269829.
LINKS
FORMULA
Empirical: a(n) = 34*a(n-1) +37*a(n-2) -7276*a(n-3) +2525*a(n-4) +294806*a(n-5) -785545*a(n-6) -1242552*a(n-7) +4983512*a(n-8) +814900*a(n-9) -9636844*a(n-10) +1645224*a(n-11) +5010412*a(n-12) -1220112*a(n-13) -975664*a(n-14) +242688*a(n-15) +70464*a(n-16) -11520*a(n-17) -2304*a(n-18) for n>19
EXAMPLE
Some solutions for n=3
..0..1..4. .4..4..1. .2..4..1. .1..4..2. .0..2..1. .1..2..3. .4..1..2
..0..3..2. .2..3..4. .4..4..4. .3..4..1. .1..4..1. .2..4..4. .2..1..0
..2..3..3. .0..3..3. .2..3..1. .3..2..1. .4..4..2. .3..4..4. .1..1..4
CROSSREFS
Cf. A269829.
Sequence in context: A221658 A188154 A268151 * A178721 A059948 A229604
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 05 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 | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified February 23 09:02 EST 2024. Contains 370276 sequences. (Running on oeis4.)