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!)
 A251903 Number of (n+2)X(6+2) 0..3 arrays with every 3X3 subblock row and column sum unequal to 4 or 5 and every diagonal and antidiagonal sum equal to 4 or 5 1
 16532, 6744, 10662, 17976, 61686, 120984, 202792, 630776, 1468994, 2840656, 8027990, 18516064, 42612832, 111147008, 273800018, 630687800, 1708859106, 4099448632, 10295037848, 25879630320, 66847115882, 161547812864 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Column 6 of A251905 LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 FORMULA Empirical: a(n) = 4*a(n-2) +9*a(n-3) +40*a(n-4) -36*a(n-5) -86*a(n-6) -360*a(n-7) -572*a(n-8) +716*a(n-9) +445*a(n-10) +5380*a(n-11) +2751*a(n-12) -1685*a(n-13) -2306*a(n-14) -29415*a(n-15) -6607*a(n-16) -13750*a(n-17) +10754*a(n-18) +71993*a(n-19) +17991*a(n-20) +89268*a(n-21) -25755*a(n-22) -97539*a(n-23) -65423*a(n-24) -216911*a(n-25) +39244*a(n-26) +134471*a(n-27) +144834*a(n-28) +231522*a(n-29) -74606*a(n-30) -172052*a(n-31) -144764*a(n-32) -71976*a(n-33) +102320*a(n-34) +68656*a(n-35) +43784*a(n-36) +10720*a(n-37) -40976*a(n-38) -7040*a(n-39) -6432*a(n-40) -2560*a(n-41) +4224*a(n-42) +1536*a(n-44) for n>48 EXAMPLE Some solutions for n=4 ..1..2..0..1..1..1..0..2....0..3..0..3..0..3..0..3....1..0..1..0..1..0..1..0 ..0..3..0..3..0..3..0..3....2..3..1..3..2..3..1..3....3..0..3..0..3..0..3..0 ..2..3..1..3..2..3..1..3....1..0..2..0..1..0..2..0....3..2..3..2..3..1..3..2 ..1..0..2..0..1..0..2..0....3..0..3..0..3..0..3..0....0..1..0..1..0..2..0..1 ..3..0..3..0..3..0..3..0....2..1..3..2..3..2..3..1....0..3..0..3..0..3..0..3 ..2..1..3..2..3..2..3..1....1..2..0..1..0..1..0..2....1..3..2..3..2..3..1..2 CROSSREFS Sequence in context: A223401 A281480 A170779 * A253956 A253963 A253759 Adjacent sequences:  A251900 A251901 A251902 * A251904 A251905 A251906 KEYWORD nonn AUTHOR R. H. Hardin, Dec 10 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 4 19:40 EST 2021. Contains 349526 sequences. (Running on oeis4.)