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A264005 Number of (2+1)X(n+1) arrays of permutations of 0..n*3+2 with each element having index change (+-,+-) 0,0 1,2 or 1,0. 1
9, 99, 1089, 8679, 69169, 568343, 4669921, 38152455, 311699025, 2548552215, 20837788609, 170360646951, 1392794147889, 11387102116407, 93097816935841, 761140735852103, 6222865786130449, 50876363432350039, 415950535502406529 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 2 of A264003.

LINKS

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

FORMULA

Empirical: a(n) = 9*a(n-1) -62*a(n-3) +108*a(n-4) -456*a(n-5) -800*a(n-6) +9808*a(n-7) -8032*a(n-8) -256*a(n-9) +12800*a(n-10) -20992*a(n-11) +27648*a(n-12) -24576*a(n-13) +32768*a(n-15) -65536*a(n-16)

EXAMPLE

Some solutions for n=4

..0..1..2..6..4....7..1..5..6..9....0..1..5..6..4....0..6..2..3..9

.10.11.14..3.12....0..3..2.13..4...12..3.14.11..2....5.11.12..1..4

..5..8..7.13..9...10.11.12..8.14...10..8..9.13..7...10..8..7.13.14

CROSSREFS

Cf. A264003.

Sequence in context: A103456 A002283 A155157 * A232943 A245927 A233907

Adjacent sequences:  A264002 A264003 A264004 * A264006 A264007 A264008

KEYWORD

nonn

AUTHOR

R. H. Hardin, Oct 31 2015

STATUS

approved

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Last modified June 15 00:00 EDT 2021. Contains 345041 sequences. (Running on oeis4.)