login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A234734 Number of (n+1)X(4+1) 0..7 arrays with every 2X2 subblock having its diagonal sum differing from its antidiagonal sum by 8 (constant stress 1X1 tilings) 1
8736, 21048, 45792, 127032, 319488, 972888, 2723040, 8836536, 26699136, 90688728, 289595232, 1018007352, 3387971328, 12231257688, 42028017120, 154964007096, 546131550336, 2047907680728, 7365720907872, 27996112930872, 102364560941568 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A234738

LINKS

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

FORMULA

Empirical: a(n) = 8*a(n-1) +53*a(n-2) -564*a(n-3) -888*a(n-4) +17184*a(n-5) -2382*a(n-6) -296784*a(n-7) +308859*a(n-8) +3196608*a(n-9) -5284083*a(n-10) -22169196*a(n-11) +48357478*a(n-12) +97763896*a(n-13) -273091508*a(n-14) -253071696*a(n-15) +976703832*a(n-16) +271829664*a(n-17) -2148744960*a(n-18) +304750080*a(n-19) +2640988800*a(n-20) -1133222400*a(n-21) -1378944000*a(n-22) +870912000*a(n-23)

EXAMPLE

Some solutions for n=4

..4..0..4..1..3....0..4..1..5..1....4..6..3..7..5....2..0..1..0..5

..1..5..1..6..0....5..1..6..2..6....6..0..5..1..7....1..7..0..7..4

..7..3..7..4..6....0..4..1..5..1....1..3..0..4..2....2..0..1..0..5

..2..6..2..7..1....6..2..7..3..7....6..0..5..1..7....1..7..0..7..4

..4..0..4..1..3....1..5..2..6..2....3..5..2..6..4....4..2..3..2..7

CROSSREFS

Sequence in context: A250999 A214171 A067867 * A250881 A234707 A257748

Adjacent sequences:  A234731 A234732 A234733 * A234735 A234736 A234737

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 30 2013

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 July 17 20:45 EDT 2019. Contains 325109 sequences. (Running on oeis4.)