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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 R. H. Hardin, Table of n, a(n) for n = 1..210 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 Adjacent sequences: A238806 A238807 A238808 * A238810 A238811 A238812 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.)