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A264551 Number of (2+1)X(n+1) arrays of permutations of 0..n*3+2 with each element having directed index change -1,1 -1,2 1,0 or 0,-1. 1
1, 2, 6, 16, 40, 96, 240, 608, 1536, 3840, 9600, 24064, 60416, 151552, 379904, 952320, 2387968, 5988352, 15015936, 37650432, 94404608, 236716032, 593559552, 1488322560, 3731881984, 9357492224, 23463460864, 58833502208, 147522060288 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Row 2 of A264550.

LINKS

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

FORMULA

Empirical: a(n) = 2*a(n-1) +8*a(n-4)

EXAMPLE

Some solutions for n=4

..1..2..6..4..8....1..5..3..4..8....1..5..3..7..8....1..2..5..4..8

..0.10.11..3.13....0.10..2.12.13....0.10..2.12..4....0..7.10..3.12

..5.12..7.14..9...11..6..7.14..9...11..6.13.14..9...11..6.13.14..9

CROSSREFS

Cf. A264550.

Sequence in context: A129952 A057711 A302239 * A293004 A265278 A111281

Adjacent sequences:  A264548 A264549 A264550 * A264552 A264553 A264554

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 17 2015

STATUS

approved

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Last modified November 14 03:52 EST 2018. Contains 317159 sequences. (Running on oeis4.)