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A263521 Number of (3+1)X(n+1) arrays of permutations of 0..n*4+3 filled by rows with each element moved a city block distance of 0 or 1, and rows and columns in increasing lexicographic order. 1
23, 208, 2076, 18369, 158109, 1317780, 10791350, 87194833, 698250904, 5555688785, 44005119429, 347432212188, 2736799922735, 21523189213085, 169068961542156, 1326964403390558, 10408686351322363, 81610767953922967, 639685545725575292 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 3 of A263519.

LINKS

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

FORMULA

Empirical: a(n) = 18*a(n-1) -83*a(n-2) -203*a(n-3) +2162*a(n-4) -633*a(n-5) -21640*a(n-6) +20040*a(n-7) +120424*a(n-8) -126960*a(n-9) -418440*a(n-10) +397224*a(n-11) +935858*a(n-12) -706132*a(n-13) -1333426*a(n-14) +768238*a(n-15) +1198092*a(n-16) -535990*a(n-17) -670920*a(n-18) +245400*a(n-19) +229128*a(n-20) -73408*a(n-21) -45880*a(n-22) +13832*a(n-23) +4959*a(n-24) -1502*a(n-25) -235*a(n-26) +77*a(n-27) +2*a(n-28) -a(n-29)

EXAMPLE

Some solutions for n=4

..0..1..2..3..4....0..1..2..3..4....0..1..2..8..9....0..2..3..8..9

.10..5.12..8.14....6..5..7.13..9....5..6..7..3..4....5..1..6..7..4

.15..6..7.18..9...15.10.12..8.14...10.11.12.13.14...11.10.17.12.13

.16.11.17.13.19...16.11.17.19.18...15.16.17.19.18...15.16.18.19.14

CROSSREFS

Cf. A263519.

Sequence in context: A107956 A022683 A042020 * A084428 A322287 A327918

Adjacent sequences:  A263518 A263519 A263520 * A263522 A263523 A263524

KEYWORD

nonn

AUTHOR

R. H. Hardin, Oct 19 2015

STATUS

approved

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Last modified June 18 15:01 EDT 2021. Contains 345120 sequences. (Running on oeis4.)