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A224191 Number of 4Xn 0..2 arrays with rows unimodal and columns nondecreasing 1
15, 225, 2205, 15779, 89380, 422488, 1727738, 6272940, 20614382, 62231446, 174603882, 459586532, 1143581612, 2707062766, 6128575771, 13328965295, 27955737041, 56730240471, 111704250407, 213954477597, 399506181220 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Row 4 of A224190

LINKS

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

FORMULA

Empirical: a(n) = (1/106748928000)*n^16 + (1/1482624000)*n^15 + (7/266872320)*n^14 + (127/197683200)*n^13 + (311999/28740096000)*n^12 + (212351/1596672000)*n^11 + (31937/26127360)*n^10 + (83129/9676800)*n^9 + (34840531/746496000)*n^8 + (9481183/48384000)*n^7 + (90994151/143700480)*n^6 + (123257231/79833600)*n^5 + (43399375531/15567552000)*n^4 + (2360326763/648648000)*n^3 + (218135/61776)*n^2 + (581099/360360)*n + 1

EXAMPLE

Some solutions for n=3

..0..0..0....0..0..1....0..1..0....0..1..0....0..0..0....1..0..0....0..0..0

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

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

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

CROSSREFS

Sequence in context: A208080 A224264 A223921 * A224349 A224008 A012852

Adjacent sequences:  A224188 A224189 A224190 * A224192 A224193 A224194

KEYWORD

nonn

AUTHOR

R. H. Hardin Apr 01 2013

STATUS

approved

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Last modified January 26 14:20 EST 2022. Contains 350598 sequences. (Running on oeis4.)