This site is supported by donations to The OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A206218 Number of (n+1)X4 0..2 arrays with rows and columns of determinants of all 2X2 subblocks lexicographically nondecreasing 1
 1970, 73133, 1782191, 35625711, 600064928, 9098547899, 131428029860, 1883474084204, 27236695360128, 398320420587108, 5870939348495954, 86941313422965979, 1290991288648976502, 19200795902731377026 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Column 3 of A206223 LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 FORMULA Empirical: a(n) = 42*a(n-1) -625*a(n-2) +2990*a(n-3) +19429*a(n-4) -300482*a(n-5) +1205989*a(n-6) +739674*a(n-7) -21921768*a(n-8) +68928624*a(n-9) -44135280*a(n-10) -218575584*a(n-11) +570862080*a(n-12) -547928064*a(n-13) +191102976*a(n-14) for n>30 EXAMPLE Some solutions for n=4 ..0..1..0..1....2..0..0..1....2..2..0..1....1..2..1..2....0..0..2..1 ..2..0..0..0....2..0..0..1....1..0..0..1....1..1..0..2....2..0..2..1 ..1..0..1..1....2..0..0..0....1..0..0..0....1..1..2..2....1..0..1..1 ..1..0..2..2....0..0..0..1....1..2..1..0....1..2..1..1....2..0..1..2 ..2..2..0..0....0..0..0..2....0..2..2..2....0..2..1..1....1..0..0..1 CROSSREFS Sequence in context: A250804 A205210 A183692 * A255967 A153352 A251816 Adjacent sequences:  A206215 A206216 A206217 * A206219 A206220 A206221 KEYWORD nonn AUTHOR R. H. Hardin Feb 04 2012 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 October 19 16:17 EDT 2019. Contains 328223 sequences. (Running on oeis4.)