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A264546 Number of (n+1)X(4+1) arrays of permutations of 0..n*5+4 with each element having directed index change -1,1 -1,2 1,0 or 0,-1. 1
1, 16, 36, 216, 1160, 4640, 23140, 110592, 501828, 2390752, 11231244, 52348752, 246436064, 1155790856, 5415128884, 25420656744, 119225756880, 559133362408, 2623138509120, 12303725497848, 57710528607716, 270708963027848 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Column 4 of A264550.

LINKS

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

FORMULA

Empirical: a(n) = 9*a(n-2) +54*a(n-3) +60*a(n-4) -54*a(n-5) -279*a(n-6) -270*a(n-7) +64*a(n-8) -864*a(n-9) -1728*a(n-10) for n>11

EXAMPLE

Some solutions for n=4

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

..0.10..2..9..4....0.10..8..9.12....0.10.11.12..4....0.10.11..9..4

.11.12.15..8.18....5..6.15.14.18....5.15..7.17..9....5..6.13.14.18

.16.17.20.13.14...16.11.20.13.23...16.20.18.13.14...16.20.12.21.23

.21.22.23.24.19...21.22.17.24.19...21.22.23.24.19...15.22.17.24.19

CROSSREFS

Cf. A264550.

Sequence in context: A075369 A318425 A273373 * A218523 A300535 A053893

Adjacent sequences:  A264543 A264544 A264545 * A264547 A264548 A264549

KEYWORD

nonn

AUTHOR

R. H. Hardin, Nov 17 2015

STATUS

approved

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Last modified November 14 09:02 EST 2018. Contains 317182 sequences. (Running on oeis4.)