[go: up one dir, main page]
login
The OEIS is supported by the many generous donors to the OEIS Foundation.
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A217887
Number of n element 1..n arrays with each element the minimum of 4 adjacent elements of a permutation of 1..n+3 of n+3 elements
0
1, 3, 11, 45, 196, 898, 4272, 21002, 106564, 558780, 3037926, 17203726, 101981944, 635338608
(list; graph; refs; listen; history; text; internal format)
OFFSET
1,2
COMMENTS
Column 4 of A217891
LINKS
Table of n, a(n) for n=1..14.
EXAMPLE
Some solutions for n=4
..1....4....1....2....2....1....1....1....3....4....3....1....4....1....1....1
..3....1....4....2....2....2....2....1....3....3....2....1....2....1....3....3
..2....1....2....1....3....4....2....3....1....1....2....2....1....1....3....4
..2....1....2....1....1....3....2....3....1....1....1....4....1....3....2....2
CROSSREFS
Sequence in context: A049172 A049155 A063024 * A151129 A151130 A216949
Adjacent sequences: A217884 A217885 A217886 * A217888 A217889 A217890
KEYWORD
nonn
AUTHOR
R. H. Hardin Oct 14 2012
STATUS
approved

Lookup Welcome Wiki Register Music Plot 2 Demos Index WebCam Contribute Format Style Sheet Transforms Superseeker Recents
The OEIS Community
Maintained by The OEIS Foundation Inc.
Last modified November 7 10:03 EST 2024. Contains 377533 sequences.
License Agreements, Terms of Use, Privacy Policy