This site is supported by donations to The OEIS Foundation.

 Please make a donation to keep the OEIS running. We are now in our 55th year. In the past year we added 12000 new sequences and reached 8000 citations (which often say "discovered thanks to the OEIS"). We need to raise money to hire someone to manage submissions, which would reduce the load on our editors and speed up editing. Other ways to donate

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A222157 Number of nX5 arrays with each row a permutation of 1..5 having at least as many downsteps as the preceding row, with rows in lexicographically nondecreasing order 1
 120, 6322, 207262, 4907711, 91075868, 1393742886, 18203084280, 207961261268, 2116883443548, 19475385665260, 163788555854232, 1270883781907016, 9168186853827174, 61890082396969113, 393107547309424404 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Column 5 of A222159 LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 R. H. Hardin, Formula for A222157 FORMULA See link for formula EXAMPLE Some solutions for n=3 ..2..3..5..1..4....1..2..5..3..4....1..5..2..3..4....3..4..2..1..5 ..5..1..2..4..3....3..5..1..4..2....3..5..2..1..4....5..3..2..1..4 ..5..1..3..4..2....5..2..3..4..1....4..3..2..5..1....5..4..2..1..3 CROSSREFS Sequence in context: A289292 A061541 A003438 * A092710 A177758 A055213 Adjacent sequences:  A222154 A222155 A222156 * A222158 A222159 A222160 KEYWORD nonn AUTHOR R. H. Hardin Feb 10 2013 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
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified December 6 19:22 EST 2019. Contains 329809 sequences. (Running on oeis4.)