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!)
 A252111 Number of (n+2) X (5+2) 0..3 arrays with every 3 X 3 subblock row and column sum equal to 0 2 3 6 or 7 and every 3 X 3 diagonal and antidiagonal sum not equal to 0 2 3 6 or 7. 1
 1884, 624, 1258, 1956, 3528, 6070, 11760, 21344, 39200, 80832, 147840, 276160, 593664, 1091072, 2059520, 4537344, 8361984, 15877120, 35450880, 65429504, 124620800, 280215552, 517570560, 987381760, 2228158464, 4117102592 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 FORMULA Empirical: a(n) = 12*a(n-3) - 32*a(n-6) for n>11. Empirical g.f.: 2*x*(942 + 312*x + 629*x^2 - 10326*x^3 - 1980*x^4 - 4513*x^5 + 24288*x^6 - 512*x^7 + 3308*x^8 + 1152*x^9 + 2304*x^10) / ((1 - 2*x)*(1 + 2*x + 4*x^2)*(1 - 4*x^3)). - Colin Barker, Dec 01 2018 EXAMPLE Some solutions for n=4: ..1..3..3..1..3..3..0....2..3..2..2..3..1..2....0..2..1..0..1..2..0 ..3..2..2..3..2..2..3....3..1..3..3..1..3..3....0..1..1..0..1..1..0 ..3..2..2..3..2..2..3....2..3..2..2..3..2..2....2..0..0..2..0..0..2 ..1..3..3..1..3..3..1....2..3..2..2..3..2..2....0..1..1..0..1..1..0 ..3..2..2..3..2..2..3....3..0..3..3..1..3..3....0..1..1..0..1..1..0 ..3..1..2..3..2..2..3....2..3..2..2..3..1..2....2..0..0..2..0..0..3 CROSSREFS Column 5 of A252114. Sequence in context: A246478 A237103 A222799 * A259960 A338705 A236613 Adjacent sequences:  A252108 A252109 A252110 * A252112 A252113 A252114 KEYWORD nonn AUTHOR R. H. Hardin, Dec 14 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 15:36 EST 2021. Contains 349526 sequences. (Running on oeis4.)