This site is supported by donations to The OEIS Foundation.

The October issue of the Notices of the Amer. Math. Soc. has an article about the OEIS.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A189435 T(n,k)=Number of nXk array permutations with each element not moving, or moving one space N, SW or SE 13
 1, 1, 1, 1, 2, 1, 1, 3, 5, 1, 1, 5, 9, 9, 1, 1, 8, 29, 31, 20, 1, 1, 13, 65, 140, 109, 41, 1, 1, 21, 181, 571, 841, 367, 85, 1, 1, 34, 441, 2413, 5680, 4653, 1245, 178, 1, 1, 55, 1165, 10069, 40065, 52241, 26589, 4247, 369, 1, 1, 89, 2929, 42205, 278105, 606201, 493941 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,5 COMMENTS Table starts .1...1.....1.......1.........1...........1.............1...............1 .1...2.....3.......5.........8..........13............21..............34 .1...5.....9......29........65.........181...........441............1165 .1...9....31.....140.......571........2413.........10069...........42205 .1..20...109.....841......5680.......40065........278105.........1940868 .1..41...367....4653.....52241......606201.......6944573........79826592 .1..85..1245...26589....493941.....9557077.....181540773......3467525301 .1.178..4247..151081...4681376...150278792....4742833745....150293731826 .1.369.14453..859264..44341381..2367212857..124239687001...6540976400913 .1.769.49167.4891841.420325171.37358187521.3261208487441.285499775348185 LINKS R. H. Hardin, Table of n, a(n) for n = 1..180 EXAMPLE Some solutions for 5X3 ..0..4..5....0..4..5....3..1..2....0..1..5....0..4..5....0..4..5....0..4..5 ..1..2..8....3..2..1....6..0..5....6..2..8....6..2..1....1..2..8....6..2..1 ..9..3.11....6.10..8....4..7..8....4..3.11....9..3.11....6..3.11....9..3..8 ..7..6.14....9.13..7....9.13.14....7.13.14....7..8.14....7.13.14....7.13.14 .12.13.10...12.11.14...12.11.10...12..9.10...12.13.10...12..9.10...12.11.10 CROSSREFS Column 2 is A105309 Row 2 is A000045(n+1) Row 3 is A006131 Sequence in context: A123349 A123352 A114163 * A279636 A290569 A230698 Adjacent sequences:  A189432 A189433 A189434 * A189436 A189437 A189438 KEYWORD nonn,tabl AUTHOR R. H. Hardin Apr 22 2011 STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified September 25 22:57 EDT 2018. Contains 315425 sequences. (Running on oeis4.)