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A264124 Number of (n+1)X(4+1) arrays of permutations of 0..n*5+4 with each element having index change +-(.,.) 0,0 1,-2 or 2,-1. 1
8, 200, 5733, 108045, 1995525, 39592980, 791859600, 15730470000, 311564912400, 6168985265520, 122179379691600, 2420106837104880, 47937671793562320, 949542664230745200, 18808314998504608080, 372550422991797293040 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A264128.

LINKS

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

FORMULA

Empirical: a(n) = 19*a(n-1) +16*a(n-2) -304*a(n-3) +5776*a(n-4) +4864*a(n-5) +4096*a(n-6) -77824*a(n-7) -65536*a(n-8) for n>11

EXAMPLE

Some solutions for n=4

..0..1..5..6..7....0..1..5.12..4....0.10..5..6.13....0..1..2..6..7

..2..3..4.17.18....2..3..7..8.18....2.15..7.11..9....5..3..4.17..9

.10.20.12.13.23...10.20.15.22.14....1.20..3..4.23...10.20.21.16.14

.15.16..8..9.19....6.16.17..9.19...12.16..8.18.19...15.13..8.18.22

.11.21.22.14.24...11.21.13.23.24...17.21.22.14.24...11.12.19.23.24

CROSSREFS

Cf. A264128.

Sequence in context: A323562 A034861 A221121 * A317631 A309904 A241224

Adjacent sequences:  A264121 A264122 A264123 * A264125 A264126 A264127

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 03 2015

STATUS

approved

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Last modified August 4 21:32 EDT 2021. Contains 346455 sequences. (Running on oeis4.)