The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

Year-end appeal: Please make a donation to the OEIS Foundation to support ongoing development and maintenance of the OEIS. We are now in our 56th year, we are closing in on 350,000 sequences, and we’ve crossed 9,700 citations (which often say “discovered thanks to the OEIS”).

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A205022 Number of (n+1)X4 0..3 arrays with the determinants of 2X2 subblocks nondecreasing rightwards and downwards 1
 15040, 275853, 7148335, 198539736, 5296848762, 139786868632, 3650380799573, 95296479247095, 2482224861095909, 64689991305033086, 1685161844199556108, 43911745208302175122, 1144174123712107860716, 29816968100738943831243 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Column 3 of A205027 LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 FORMULA Empirical: a(n) = 56*a(n-1) -742*a(n-2) -9488*a(n-3) +284911*a(n-4) -1227272*a(n-5) -17654568*a(n-6) +180271872*a(n-7) -212758272*a(n-8) -3603750912*a(n-9) +17151492096*a(n-10) -28116025344*a(n-11) +14619377664*a(n-12) for n>27 EXAMPLE Some solutions for n=4 ..0..3..0..3....1..0..1..3....3..0..3..1....1..2..3..3....1..0..0..3 ..1..2..0..3....3..0..0..0....1..0..2..1....2..2..2..2....2..0..0..3 ..1..0..0..1....2..0..3..3....3..0..2..2....0..0..0..0....2..0..0..1 ..2..0..0..3....1..0..1..1....1..0..1..2....3..0..2..2....1..0..0..2 ..0..0..0..1....2..0..3..3....1..0..0..2....2..0..3..3....3..0..0..1 CROSSREFS Sequence in context: A147578 A285993 A295453 * A207297 A151595 A254581 Adjacent sequences:  A205019 A205020 A205021 * A205023 A205024 A205025 KEYWORD nonn AUTHOR R. H. Hardin Jan 21 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 December 2 12:01 EST 2021. Contains 349440 sequences. (Running on oeis4.)