login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A234732 Number of (n+1)X(2+1) 0..7 arrays with every 2X2 subblock having its diagonal sum differing from its antidiagonal sum by 8 (constant stress 1X1 tilings) 2
672, 2184, 6048, 21048, 64320, 233016, 760608, 2827992, 9650112, 36532344, 128569248, 493143768, 1774812480, 6874544376, 25161581088, 98188573272, 364094768832, 1428934093944, 5353358809248, 21102161187288, 79707896139840 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 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=5

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

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

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

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

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

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

CROSSREFS

Sequence in context: A233315 A157363 A308574 * A057805 A057796 A057797

Adjacent sequences:  A234729 A234730 A234731 * A234733 A234734 A234735

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 October 27 19:51 EDT 2021. Contains 348288 sequences. (Running on oeis4.)