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A217891 T(n,k) is the number of n element 1..n arrays with each element the minimum of k adjacent elements of a permutation of 1..n+k-1 of n+k-1 elements. 7
1, 1, 2, 1, 3, 6, 1, 3, 10, 24, 1, 3, 11, 40, 120, 1, 3, 11, 44, 182, 720, 1, 3, 11, 45, 192, 938, 5040, 1, 3, 11, 45, 196, 892, 5424, 40320, 1, 3, 11, 45, 197, 898, 4400, 34788, 362880, 1, 3, 11, 45, 197, 902, 4272, 23086, 244544, 3628800, 1, 3, 11, 45, 197, 903, 4274, 21002, 129250, 1865144, 39916800 (list; table; graph; refs; listen; history; text; internal format)
OFFSET
1,3
LINKS
EXAMPLE
Table starts:
.........1.........1........1........1........1........1.......1......1......1
.........2.........3........3........3........3........3.......3......3......3
.........6........10.......11.......11.......11.......11......11.....11.....11
........24........40.......44.......45.......45.......45......45.....45.....45
.......120.......182......192......196......197......197.....197....197....197
.......720.......938......892......898......902......903.....903....903....903
......5040......5424.....4400.....4272.....4274.....4278....4279...4279...4279
.....40320.....34788....23086....21002....20790....20788...20792..20793..20793
....362880....244544...129250...106564...103354...103050..103044.103048.103049
...3628800...1865144...773868...558780...523786...519268..518864.518854
..39916800..15312976..4953208..3037926..2703206..2653278.2647244
.479001600.134495328.33778104.17203726.14210824.13725388
Some solutions for n=4 and k=4:
..1....2....3....1....2....2....1....1....1....2....1....1....4....2....2....3
..2....4....4....1....4....3....3....3....1....1....1....1....3....2....2....3
..3....1....2....3....3....4....4....2....2....1....3....4....1....1....4....2
..3....1....1....3....1....1....2....2....3....1....4....3....1....1....1....1
CROSSREFS
Diagonal is A001003.
Sequence in context: A081520 A238955 A238968 * A322044 A010251 A051537
KEYWORD
nonn,tabl
AUTHOR
R. H. Hardin, Oct 14 2012
STATUS
approved

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Last modified March 29 00:26 EDT 2024. Contains 371264 sequences. (Running on oeis4.)