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!)
 A266062 Number of nX2 integer arrays with each element equal to the number of horizontal, vertical, diagonal and antidiagonal neighbors exactly one smaller than itself. 1
 3, 17, 35, 89, 323, 1057, 3027, 9257, 29835, 92561, 288027, 898873, 2818275, 8824849, 27652507, 86466761, 270984643, 849833089, 2661782123, 8337922937, 26141124755, 81934791281, 256731280891, 804699050537, 2522377797859, 7905371708193 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Column 2 of A266067. LINKS R. H. Hardin, Table of n, a(n) for n = 1..210 FORMULA Empirical: a(n) = a(n-1) +2*a(n-2) +20*a(n-3) +30*a(n-4) -50*a(n-5) -160*a(n-6) -512*a(n-7) -404*a(n-8) +948*a(n-9) +1880*a(n-10) +4248*a(n-11) +1088*a(n-12) -3776*a(n-13) -7488*a(n-14) -5376*a(n-15) +4352*a(n-16) +4608*a(n-17) +8192*a(n-18) EXAMPLE Some solutions for n=4 ..0..1....0..1....0..0....2..2....1..0....0..0....1..0....1..0....1..2....0..1 ..2..1....2..2....0..0....1..1....1..1....2..2....2..2....1..1....1..0....2..1 ..2..2....1..0....0..2....1..0....1..1....1..1....1..0....1..1....2..2....2..2 ..1..0....1..2....1..1....1..2....1..0....1..0....1..1....0..1....1..0....0..1 CROSSREFS Cf. A266067. Sequence in context: A146021 A146133 A297735 * A031290 A152908 A031386 Adjacent sequences:  A266059 A266060 A266061 * A266063 A266064 A266065 KEYWORD nonn AUTHOR R. H. Hardin, Dec 20 2015 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 5 20:39 EST 2021. Contains 349558 sequences. (Running on oeis4.)