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A264331 Number of (n+1)X(3+1) arrays of permutations of 0..n*4+3 with each element having directed index change -1,1 1,0 1,-1 or 0,-1. 1
1, 4, 11, 40, 133, 464, 1573, 5373, 18376, 62754, 214317, 732135, 2500884, 8542281, 29179002, 99670233, 340453584, 1162924217, 3972328112, 13568709449, 46348108164, 158316261005, 540777999819, 1847193977280, 6309660580860 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 3 of A264336.

LINKS

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

FORMULA

Empirical: a(n) = 5*a(n-2) +17*a(n-3) +22*a(n-4) +5*a(n-5) -29*a(n-6) -44*a(n-7) -25*a(n-8) +11*a(n-9) +20*a(n-10) +11*a(n-11) -a(n-12) -2*a(n-13) -a(n-14)

EXAMPLE

Some solutions for n=4

..1..4..5..6....1..2..5..6....1..4..3..6....1..4..3..6....1..4..3..6

..0..2..7..3....0..8..9..3....0..2..9.10....0..8..2.10....0..2..7.10

..9.12.13.14....4.10..7.14....5.12..7.14....5.12.13..7....9..5.11.14

..8.16.10.11...13.16.17.11....8.16.11.18....9.16.11.18....8.16.17.18

.17.18.19.15...12.18.19.15...17.13.19.15...17.14.19.15...12.13.19.15

CROSSREFS

Cf. A264336.

Sequence in context: A149262 A149263 A149264 * A243760 A149265 A149266

Adjacent sequences:  A264328 A264329 A264330 * A264332 A264333 A264334

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 11 2015

STATUS

approved

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Last modified November 15 11:18 EST 2019. Contains 329144 sequences. (Running on oeis4.)