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

 Please make a donation to keep the OEIS running. We are now in our 56th year. In the past year we added 10000 new sequences and reached almost 9000 citations (which often say "discovered thanks to the OEIS"). Other ways to donate

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A252575 Number of (1+2)X(n+2) 0..3 arrays with every 3X3 subblock row and diagonal sum equal to 1 2 5 6 or 7 and every 3X3 column and antidiagonal sum not equal to 1 2 5 6 or 7 1
 702, 843, 1069, 1694, 2985, 5401, 9936, 18972, 36144, 68328, 132259, 254014, 483085, 937293, 1802438, 3435781, 6666327, 12816791, 24467952, 47451918, 91181264, 174286544, 337798170, 648685210, 1241316959, 2404367968, 4614248202 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Row 1 of A252574 LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 FORMULA Empirical: a(n) = 25*a(n-3) +a(n-4) -239*a(n-6) -23*a(n-7) +1103*a(n-9) +192*a(n-10) -2670*a(n-12) -696*a(n-13) +3918*a(n-15) +1086*a(n-16) -4034*a(n-18) -1050*a(n-19) +3218*a(n-21) +848*a(n-22) -1969*a(n-24) -472*a(n-25) +889*a(n-27) +177*a(n-28) -303*a(n-30) -63*a(n-31) +63*a(n-33) for n>43 EXAMPLE Some solutions for n=4 ..1..3..2..1..3..2....3..1..1..0..0..1....2..3..2..2..3..2....2..2..2..3..0..3 ..0..0..2..0..0..1....3..1..2..2..1..2....0..0..1..0..0..2....1..1..0..1..1..3 ..2..0..0..2..0..0....2..2..1..2..2..1....2..0..0..2..0..0....0..0..2..0..3..2 CROSSREFS Sequence in context: A303689 A252567 A252574 * A252566 A269542 A237632 Adjacent sequences:  A252572 A252573 A252574 * A252576 A252577 A252578 KEYWORD nonn AUTHOR R. H. Hardin, Dec 18 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 November 29 14:14 EST 2020. Contains 338769 sequences. (Running on oeis4.)