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A263599
Number of (n+1)X(2+1) arrays of permutations of 0..n*3+2 filled by rows with each element moved a city block distance of 0 or 2, and rows and columns in increasing lexicographic order.
1
7, 144, 1962, 24091, 317857, 4177099, 54493144, 712019936, 9311616740, 121698578760, 1590445585904, 20787186128767, 271689339733549, 3550916434372500, 46409692414371788, 606566062523535434
OFFSET
1,1
COMMENTS
Column 2 of A263602.
FORMULA
Empirical recurrence of order 53 (see link above)
EXAMPLE
Some solutions for n=4
..0..1..4....0..3..4....0..3..4....0..3..4....0..3..8....0..1..2....0..3..4
..7..2..3....1.10..7....7..2..1....5..2..7....1..6..5....3..8..7....7..2..1
..8.13..6....8..5..2...10..5..6...10..1..8...10..9..2....6..5.14....8.11..6
.11.10..5....9..6.13...13..8..9...13..6..9...11..4.13...11..4..9....9.12..5
.14..9.12...14.11.12...14.11.12...14.11.12...12..7.14...12.13.10...10.13.14
CROSSREFS
Cf. A263602.
Sequence in context: A333088 A286398 A104240 * A217341 A156978 A163028
KEYWORD
nonn
AUTHOR
R. H. Hardin, Oct 22 2015
STATUS
approved