This site is supported by donations to The OEIS Foundation. Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A240382 Number of 2 X n 0..3 arrays with no element equal to zero plus the sum of elements to its left or two plus the sum of the elements above it or zero plus the sum of the elements diagonally to its northwest, modulo 4. 1
 4, 10, 38, 90, 366, 878, 3606, 8666, 35602, 85550, 351418, 844394, 3468498, 8334126, 34233910, 82257450, 337887294, 811877790, 3334934438, 8013202282, 32915673442, 79089995358, 324876418346, 780615181818, 3206517628418, 7704641519326 (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-2) - 24*a(n-4) + 31*a(n-6) - 16*a(n-8). Empirical g.f.: 2*x*(1 - x)*(2 + 7*x + 2*x^2 - 13*x^3 - 10*x^4 + 9*x^5 + 10*x^6) / (1 - 12*x^2 + 24*x^4 - 31*x^6 + 16*x^8). - Colin Barker, Oct 27 2018 EXAMPLE Some solutions for n=4: ..3..1..3..1....3..1..3..1....1..3..1..3....1..3..1..3....3..1..3..1 ..3..2..2..2....2..0..0..1....1..3..2..3....2..3..2..0....3..2..3..2 CROSSREFS Row 2 of A240381. Sequence in context: A102755 A197551 A046562 * A220198 A197051 A149191 Adjacent sequences:  A240379 A240380 A240381 * A240383 A240384 A240385 KEYWORD nonn AUTHOR R. H. Hardin, Apr 04 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 May 19 12:59 EDT 2019. Contains 323393 sequences. (Running on oeis4.)