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A264191 Number of (n+1)X(2+1) arrays of permutations of 0..n*3+2 with each element having index change +-(.,.) 0,0 0,2 or 2,1. 1
4, 18, 81, 360, 1600, 6760, 28561, 120666, 509796, 2159850, 9150625, 38768400, 164249856, 695767824, 2947295521, 12484841330, 52886200900, 224029644930, 949005240561, 4020052555512, 17029223715904, 72136947419128 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 2 of A264195.
LINKS
FORMULA
Empirical: a(n) = 4*a(n-1) +a(n-2) -17*a(n-4) +68*a(n-5) +17*a(n-6) +17*a(n-8) -68*a(n-9) -17*a(n-10) +a(n-12) -4*a(n-13) -a(n-14)
EXAMPLE
Some solutions for n=4
..2..1..0....2..1..0....0..1..2....7..8..2....0..1..2....0..8..2....7..8..2
..3..4..5....5.11..3....3.11..5....5.11..3....5..4..3....3..4..5....5..4..3
..8..7..6....6.14..8...13.14..8...13..0..1....6..7..8...13..7..1...13..0..1
.11.10..9....9.10..4....9.10..4....9.10..4...11.10..9...11.10..9...11.10..9
.12.13.14...12.13..7...12..6..7...12..6.14...12.13.14...14..6.12...12..6.14
CROSSREFS
Cf. A264195.
Sequence in context: A264004 A282708 A252823 * A257060 A181610 A264927
KEYWORD
nonn
AUTHOR
R. H. Hardin, Nov 07 2015
STATUS
approved

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Last modified April 22 00:17 EDT 2024. Contains 371886 sequences. (Running on oeis4.)