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A238809 Number of nX5 0..2 arrays with no element equal to one plus the sum of elements to its left or one plus the sum of the sum of elements above it, modulo 3 1
6, 39, 254, 1501, 7502, 31125, 111564, 356666, 1041746, 2828429, 7227752, 17541293, 40706954, 90804704, 195525484, 407797895, 826187028, 1629896763, 3137605666, 5904488589, 10879371862, 19655065895, 34860900004, 60769196108, 104219292070 (list; graph; refs; listen; history; text; internal format)
OFFSET
1,1
COMMENTS
Column 5 of A238812
LINKS
FORMULA
Empirical: a(n) = (1/4572288000)*n^15 - (977/43589145600)*n^14 + (2063/1334361600)*n^13 - (3407/47900160)*n^12 + (8955043/3592512000)*n^11 - (52157/777600)*n^10 + (81530299/57153600)*n^9 - (146333539/6096384)*n^8 + (209014719719/653184000)*n^7 - (29159596579/8709120)*n^6 + (1769086509077/65318400)*n^5 - (565086990557/3421440)*n^4 + (510122386391417/698544000)*n^3 - (166274896650011/75675600)*n^2 + (1441644437297/360360)*n - 3304835 for n>6
EXAMPLE
Some solutions for n=5
..0..0..0..0..2....0..0..0..2..2....0..0..2..2..0....0..0..0..2..2
..0..0..2..2..1....0..0..0..2..2....0..0..2..1..0....0..2..2..1..1
..2..2..1..1..2....0..0..2..1..0....0..2..1..0..2....0..2..1..0..2
..2..1..0..2..2....0..2..2..1..1....0..2..1..0..2....2..1..2..2..1
..0..0..0..2..1....0..2..1..2..1....0..0..0..0..0....2..1..2..1..0
CROSSREFS
Sequence in context: A145664 A305289 A090018 * A006256 A052392 A370376
KEYWORD
nonn
AUTHOR
R. H. Hardin, Mar 05 2014
STATUS
approved

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Last modified June 22 08:18 EDT 2024. Contains 373567 sequences. (Running on oeis4.)