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A223617 Number of n X 5 0..1 arrays with rows and columns unimodal. 1
16, 256, 2582, 17594, 89630, 367216, 1271969, 3857481, 10504174, 26169386, 60506898, 131289614, 269716032, 528358366, 992720569, 1797620937, 3149899316, 5359276060, 8879561670, 14362835354, 22729680458, 35259087700, 53702216265 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 5 of A223620.

LINKS

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

FORMULA

Empirical: a(n) = (359/453600)*n^10 + (251/30240)*n^9 + (3817/60480)*n^8 + (73/280)*n^7 + (1127/1350)*n^6 + (485/288)*n^5 + (532219/181440)*n^4 + (25699/7560)*n^3 + (30811/8400)*n^2 + (451/210)*n + 1.

EXAMPLE

Some solutions for n=4

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

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

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

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

CROSSREFS

Cf. A223620.

Sequence in context: A189112 A181215 A223666 * A174335 A297377 A283860

Adjacent sequences:  A223614 A223615 A223616 * A223618 A223619 A223620

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 24 2013

STATUS

approved

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Last modified May 25 02:55 EDT 2022. Contains 354047 sequences. (Running on oeis4.)