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A223948 Number of nX7 0..1 arrays with diagonals and antidiagonals unimodal and rows nondecreasing 1
8, 64, 352, 1479, 5233, 16845, 52532, 166076, 545443, 1866509, 6584260, 23605163, 85081408, 306598781, 1103114341, 3965858837, 14265857551, 51394273661, 185496356237, 670659535731, 2428046038680, 8798879746069, 31906100994095 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 7 of A223949

LINKS

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

FORMULA

Empirical: a(n) = 8*a(n-1) -20*a(n-2) +11*a(n-3) +23*a(n-4) -32*a(n-5) +18*a(n-6) -37*a(n-7) +65*a(n-8) -257*a(n-9) -274*a(n-10) -1437*a(n-11) +3612*a(n-12) +1576*a(n-13) +6921*a(n-14) +449*a(n-15) +4935*a(n-16) +22314*a(n-17) +7279*a(n-18) -8809*a(n-19) -58688*a(n-20) -81734*a(n-21) -86761*a(n-22) -2940*a(n-23) -21650*a(n-24) +16326*a(n-25) +13737*a(n-26) +26159*a(n-27) +10634*a(n-28) +2502*a(n-29) -384*a(n-30) -24*a(n-31) -80*a(n-32) -16*a(n-33)

EXAMPLE

Some solutions for n=3

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

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

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

CROSSREFS

Sequence in context: A223843 A267189 A181480 * A224151 A225014 A228460

Adjacent sequences:  A223945 A223946 A223947 * A223949 A223950 A223951

KEYWORD

nonn

AUTHOR

R. H. Hardin Mar 29 2013

STATUS

approved

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Last modified March 28 15:02 EDT 2020. Contains 333089 sequences. (Running on oeis4.)