

A263738


Number of length n arrays of permutations of 0..n1 with each element moved by 2 to 2 places and equal numbers of elements moved upwards and downwards


1



1, 2, 4, 10, 19, 43, 90, 202, 434, 971, 2133, 4780, 10634, 23918, 53667, 121159, 273464, 619510, 1404284, 3190779, 7256305, 16529258, 37686110, 86028558, 196547581, 449479587, 1028674074, 2356054490, 5399827384, 12383951473, 28417821421
(list;
graph;
refs;
listen;
history;
text;
internal format)



OFFSET

1,2


COMMENTS

Column 2 of A263744


LINKS

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


EXAMPLE

Some solutions for n=7
..0....2....1....2....1....0....0....1....2....1....0....0....2....2....0....2
..1....0....0....1....0....1....2....3....1....0....1....2....1....1....3....0
..3....3....2....0....3....3....1....0....0....4....2....4....0....0....4....3
..5....1....5....5....2....2....3....5....4....2....3....1....3....5....1....1
..2....4....3....4....4....6....6....2....3....5....5....3....4....3....2....5
..4....5....6....3....5....5....5....4....5....3....4....6....5....6....6....4
..6....6....4....6....6....4....4....6....6....6....6....5....6....4....5....6


CROSSREFS

Cf. A263744
Sequence in context: A043330 A295961 A219555 * A011963 A083844 A026554
Adjacent sequences: A263735 A263736 A263737 * A263739 A263740 A263741


KEYWORD

nonn


AUTHOR

R. H. Hardin, Oct 25 2015


STATUS

approved



