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!)
A234163 Number of (n+1)X(2+1) 0..4 arrays with every 2X2 subblock having its diagonal sum differing from its antidiagonal sum by 2 (constant stress 1X1 tilings) 1
766, 4970, 32070, 208412, 1353986, 8846884, 57811490, 380032300, 2498158614, 16525702136, 109291218482, 727617468480, 4841329246098, 32438005700384, 217127834616758, 1463930354942564, 9855977995905954, 66852413995644068 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A234169

LINKS

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

FORMULA

Empirical: a(n) = 17*a(n-1) +16*a(n-2) -1651*a(n-3) +5750*a(n-4) +45373*a(n-5) -252572*a(n-6) -278797*a(n-7) +2737923*a(n-8) +518738*a(n-9) -11300724*a(n-10) +169584*a(n-11) +18786600*a(n-12) -2246544*a(n-13) -13289184*a(n-14) +2960064*a(n-15) +3359232*a(n-16) -1119744*a(n-17)

EXAMPLE

Some solutions for n=3

..3..1..3....0..0..0....3..4..2....2..0..2....1..0..4....2..4..4....4..2..3

..2..2..2....1..3..1....1..4..4....0..0..0....4..1..3....2..2..4....3..3..2

..2..0..2....3..3..3....1..2..4....4..2..4....2..1..1....4..2..2....4..2..3

..2..2..2....0..2..4....3..2..2....4..4..4....3..4..2....2..2..4....3..3..2

CROSSREFS

Sequence in context: A343705 A247486 A125109 * A159209 A045142 A115934

Adjacent sequences:  A234160 A234161 A234162 * A234164 A234165 A234166

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 20 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 25 11:29 EDT 2021. Contains 348251 sequences. (Running on oeis4.)