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!)
 A251841 Number of (n+2)X(4+2) 0..3 arrays with every 3X3 subblock row and column sum nonprime and every diagonal and antidiagonal sum prime 1
 872, 1229, 2890, 5860, 18708, 48692, 100973, 328235, 861182, 1788541, 5811485, 15259891, 31702266, 102964722, 270439630, 561937573, 1824434189, 4793021422, 9960951265, 32328609957, 84950562777, 176575774214, 572879745560 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Column 4 of A251845 LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 FORMULA Empirical: a(n) = 41*a(n-3) -521*a(n-6) +2122*a(n-9) -3698*a(n-12) +2906*a(n-15) -927*a(n-18) +157*a(n-21) -89*a(n-24) +10*a(n-27) for n>32 EXAMPLE Some solutions for n=4 ..1..0..0..1..0..3....1..2..1..1..2..1....0..1..0..0..1..0....2..1..1..2..1..1 ..1..0..3..1..0..0....0..1..0..0..1..0....0..1..3..0..1..3....0..2..2..0..2..2 ..2..1..1..2..1..1....3..1..0..3..1..0....1..2..1..1..2..1....2..1..1..2..1..1 ..1..0..0..1..0..0....1..2..1..1..2..1....0..1..0..0..1..0....2..1..1..2..1..1 ..1..0..3..1..0..3....0..1..0..0..1..0....0..1..0..3..1..0....0..2..2..0..2..2 ..2..1..1..2..1..1....0..1..3..0..1..3....1..2..1..1..2..1....2..1..1..2..1..3 CROSSREFS Sequence in context: A031783 A253167 A214285 * A251085 A334011 A206312 Adjacent sequences:  A251838 A251839 A251840 * A251842 A251843 A251844 KEYWORD nonn AUTHOR R. H. Hardin, Dec 09 2014 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 1 16:44 EST 2021. Contains 349430 sequences. (Running on oeis4.)