The OEIS is supported by the many generous donors to the OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A223323 Rolling icosahedron footprints: number of 3 X n 0..11 arrays starting with 0 where 0..11 label vertices of an icosahedron and every array movement to a horizontal or antidiagonal neighbor moves along an icosahedral edge. 1
 144, 3125, 105625, 3570125, 122039125, 4176940625, 142980696625, 4894441131125, 167544253118125, 5735298712573625, 196328142425559625, 6720615878249268125, 230057073000574997125, 7875209325727694302625, 269580591960578208870625 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Row 3 of A223321. LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 FORMULA Empirical: a(n) = 38*a(n-1) - 129*a(n-2) for n>4. Empirical g.f.: x*(144 - 2347*x + 5451*x^2 - 40500*x^3) / (1 - 38*x + 129*x^2). - Colin Barker, Aug 19 2018 EXAMPLE Some solutions for n=3: ..0..6..5....0..7..3....0..1..8....0..7.11....0..7.11....0..7..1....0..7..1 ..4.10..4....3..8..2....0..1..8....3..7..3....0..7..1....1..2..8....1..8..4 .11..9..3....1..8..1....2..1..2....3..9..8...11..3..7....0..1..7....9..8..4 Vertex neighbors: 0 -> 1 2 5 6 7 1 -> 0 2 3 7 8 2 -> 0 1 4 6 8 3 -> 1 7 8 9 11 4 -> 2 6 8 9 10 5 -> 0 6 7 10 11 6 -> 0 2 4 5 10 7 -> 0 1 3 5 11 8 -> 1 2 3 4 9 9 -> 3 4 8 10 11 10 -> 4 5 6 9 11 11 -> 3 5 7 9 10 CROSSREFS Cf. A223321. Sequence in context: A264107 A231584 A221695 * A251433 A223300 A330837 Adjacent sequences:  A223320 A223321 A223322 * A223324 A223325 A223326 KEYWORD nonn AUTHOR R. H. Hardin, Mar 19 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 | Recents
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified June 28 21:04 EDT 2022. Contains 354907 sequences. (Running on oeis4.)