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A238808 Number of nX4 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
5, 25, 118, 468, 1501, 4167, 10423, 24115, 52449, 108395, 214496, 408732, 753333, 1347741, 2347301, 3989727, 6631953, 10800653, 17260510, 27105244, 41877485, 63724811, 95600675, 141520531, 206885249, 298885895, 427006156, 603641124 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A238812

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..210

FORMULA

Empirical: a(n) = (1/302400)*n^10 - (13/90720)*n^9 + (37/6720)*n^8 - (451/3780)*n^7 + (29063/14400)*n^6 - (100891/4320)*n^5 + (11871787/60480)*n^4 - (25402589/22680)*n^3 + (35075741/8400)*n^2 - (2861612/315)*n + 8719 for n>4

EXAMPLE

Some solutions for n=5

..2..2..0..0....0..0..0..0....0..0..2..2....0..0..0..2....0..0..0..0

..2..1..0..0....0..2..2..0....2..2..1..1....2..2..0..1....0..2..2..0

..0..0..0..2....0..2..1..0....2..1..2..2....2..1..0..0....0..2..2..0

..0..0..2..1....0..0..2..2....0..2..2..1....0..2..2..0....2..1..0..2

..0..2..1..0....2..1..2..2....0..2..1..0....0..2..1..2....2..2..1..1

CROSSREFS

Sequence in context: A200781 A055297 A244828 * A034274 A110212 A344097

Adjacent sequences:  A238805 A238806 A238807 * A238809 A238810 A238811

KEYWORD

nonn

AUTHOR

R. H. Hardin, Mar 05 2014

STATUS

approved

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Last modified September 21 00:14 EDT 2021. Contains 347596 sequences. (Running on oeis4.)