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!)
 A283860 Number of 4Xn 0..1 arrays with no 1 equal to more than three of its horizontal, diagonal and antidiagonal neighbors. 1
 16, 256, 2837, 35373, 456316, 5742620, 72394838, 916118713, 11578902038, 146303878883, 1849120160189, 23370319192081, 295356801554484, 3732805298242779, 47176419243543777, 596229278644402659 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Row 4 of A283857. LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 FORMULA Empirical: a(n) = 8*a(n-1) +28*a(n-2) +366*a(n-3) +386*a(n-4) -779*a(n-5) -7223*a(n-6) -24938*a(n-7) -38986*a(n-8) -8415*a(n-9) +26074*a(n-10) -17823*a(n-11) -21705*a(n-12) +40001*a(n-13) +40567*a(n-14) -22002*a(n-15) -44398*a(n-16) +15085*a(n-17) +24099*a(n-18) +3105*a(n-19) -1004*a(n-20) -3751*a(n-21) -1424*a(n-22) +52*a(n-23) +59*a(n-24) -894*a(n-25) -146*a(n-26) +193*a(n-27) -14*a(n-28) EXAMPLE Some solutions for n=4 ..0..1..0..0. .0..0..0..1. .0..1..0..1. .1..0..1..0. .1..0..1..1 ..0..0..1..1. .0..1..0..0. .0..0..0..0. .0..0..0..1. .1..0..0..0 ..0..0..0..0. .0..0..1..0. .1..0..0..0. .0..1..1..0. .0..1..1..0 ..1..1..0..1. .1..1..1..0. .1..0..0..1. .0..0..1..0. .0..1..0..0 CROSSREFS Cf. A283857. Sequence in context: A223617 A174335 A297377 * A223660 A223565 A223677 Adjacent sequences:  A283857 A283858 A283859 * A283861 A283862 A283863 KEYWORD nonn AUTHOR R. H. Hardin, Mar 17 2017 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 11 21:00 EST 2019. Contains 329937 sequences. (Running on oeis4.)