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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A212834 Number of 0..7 arrays of length n+1 with 0 never adjacent to 7. 1
62, 482, 3746, 29114, 226274, 1758602, 13667858, 106226618, 825593474, 6416514026, 49869159026, 387583197338, 3012297335522, 23411580532682, 181954847741906, 1414153417389434, 10990803008177474, 85420541561578922 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 7 of A212835.

LINKS

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

FORMULA

Empirical: a(n) = 7*a(n-1) + 6*a(n-2).

Empirical g.f.: 2*x*(31 + 24*x) / (1 - 7*x - 6*x^2). - Colin Barker, Jul 21 2018

EXAMPLE

Some solutions for n=5:

..4....4....2....6....2....4....0....2....4....2....2....0....2....4....2....4

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

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

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

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

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

CROSSREFS

Cf. A212835.

Sequence in context: A010746 A124995 A020191 * A202959 A209913 A209906

Adjacent sequences:  A212831 A212832 A212833 * A212835 A212836 A212837

KEYWORD

nonn

AUTHOR

R. H. Hardin, May 28 2012

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 November 19 08:44 EST 2019. Contains 329318 sequences. (Running on oeis4.)