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A264879 Number of (2+1)X(n+1) arrays of permutations of 0..n*3+2 with each element having directed index change 0,1 0,-1 -2,0 or 1,1. 2
1, 0, 1, 1, 7, 20, 49, 175, 323, 1085, 2290, 6489, 15751, 41749, 105514, 276079, 706396, 1825615, 4714184, 12103729, 31297188, 80431077, 207561706, 534335127, 1377615603, 3548250067, 9145959294, 23561913471, 60719538527, 156456169973 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,5

COMMENTS

Row 2 of A264878.

LINKS

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

FORMULA

Empirical: a(n) = 10*a(n-2) +6*a(n-3) -42*a(n-4) -40*a(n-5) +117*a(n-6) +143*a(n-7) -222*a(n-8) -266*a(n-9) +272*a(n-10) +266*a(n-11) -222*a(n-12) -143*a(n-13) +117*a(n-14) +40*a(n-15) -42*a(n-16) -6*a(n-17) +10*a(n-18) -a(n-20)

EXAMPLE

All solutions for n=4

.10..2.12..4.14

..6..0..1..9..3

.11..5.13..7..8

CROSSREFS

Cf. A264878.

Sequence in context: A299384 A007044 A047862 * A320681 A048755 A055267

Adjacent sequences:  A264876 A264877 A264878 * A264880 A264881 A264882

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 27 2015

STATUS

approved

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Last modified July 6 12:26 EDT 2022. Contains 355110 sequences. (Running on oeis4.)