This site is supported by donations to The OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A267903 Number of 3Xn arrays containing n copies of 0..3-1 with every element equal to at least one horizontal or vertical neighbor and the top left element equal to 0. 1
 0, 6, 20, 268, 2324, 28318, 315196, 3786836, 45099306, 547824556, 6687936028, 82350672500, 1019550923830, 12691867518330, 158695413996448, 1992293553570646, 25099547132728742, 317210539882144928 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Row 3 of A267901. LINKS R. H. Hardin, Table of n, a(n) for n = 1..41 EXAMPLE Some solutions for n=4 ..0..2..1..1....0..0..2..2....0..0..1..1....0..2..2..1....0..0..1..1 ..0..2..0..2....2..2..1..0....2..1..1..0....0..0..0..1....2..0..1..1 ..1..1..0..2....1..1..1..0....2..2..2..0....1..1..2..2....2..0..2..2 CROSSREFS Cf. A267901. Sequence in context: A027268 A000388 A227769 * A280039 A216912 A175671 Adjacent sequences:  A267900 A267901 A267902 * A267904 A267905 A267906 KEYWORD nonn AUTHOR R. H. Hardin, Jan 22 2016 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 March 21 04:59 EDT 2019. Contains 321364 sequences. (Running on oeis4.)