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 A183247 Number of permutations of 1..2*n+4 with each element displaced by at least n. 2
 265, 1708, 13365, 114124, 998112, 8751552, 76915200, 677461056, 5979015552, 52866428352, 468241962240, 4153739516736, 36900195503232, 328234303349952, 2923170205716480, 26061029280983616, 232569271090134912 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Row 5 of A183244. LINKS R. H. Hardin, Table of n, a(n) for n = 1..35 FORMULA Empirical (for n>=4): 85264*9^(n-4) + 7203*2^(3*n-10) + 48*5^(n-4). - Vaclav Kotesovec, Nov 27 2012 Conjectures from Colin Barker, Mar 27 2018: (Start) G.f.: x*(265 - 4122*x + 17394*x^2 - 7150*x^3 - 29191*x^4 - 100844*x^5) / ((1 - 5*x)*(1 - 8*x)*(1 - 9*x)). a(n) = 22*a(n-1) - 157*a(n-2) + 360*a(n-3) for n>6. (End) EXAMPLE Some permutations of 1-8 with minimum displacement 2: (7,4,5,8,3,2,1,6) (8,6,5,7,1,3,4,2) (8,4,5,6,7,2,1,3) (3,7,1,6,8,4,2,5) (8,4,6,2,7,3,5,1) (6,5,7,8,3,2,1,4) (3,7,6,8,2,1,5,4) (5,4,6,7,8,1,2,3) (4,8,6,7,2,1,3,5) (6,7,5,8,2,1,4,3) (7,5,6,1,8,3,2,4) (3,8,5,2,7,1,4,6) (4,7,1,2,8,3,5,6) (7,4,5,1,8,2,3,6) (7,6,5,2,8,3,4,1) (3,5,7,8,1,4,2,6) (5,6,7,8,2,4,3,1) (7,5,6,8,2,1,3,4) (5,8,6,7,2,3,1,4) (3,6,8,1,7,4,2,5) CROSSREFS Cf. A183244. Sequence in context: A202416 A202471 A202464 * A094795 A023043 A211719 Adjacent sequences: A183244 A183245 A183246 * A183248 A183249 A183250 KEYWORD nonn AUTHOR R. H. Hardin, Jan 03 2011 STATUS approved

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Last modified June 2 04:34 EDT 2023. Contains 363081 sequences. (Running on oeis4.)