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A235408 Number of (n+1)X(3+1) 0..1 arrays with 2X2 subblock sums lexicographically nondecreasing rowwise and nonincreasing columnwise 1
121, 704, 4256, 20398, 98575, 397340, 1623115, 5744912, 20612708, 65877470, 213190201, 627225413, 1867007833, 5131067959, 14261504547, 37041121138, 97280493869, 241057367009, 603912355679, 1438964930953, 3465601783227 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A235413

LINKS

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

R. H. Hardin, Empirical recurrence of order 73

FORMULA

Empirical recurrence of order 73 (see link above)

EXAMPLE

Some solutions for n=4

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

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

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

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

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

CROSSREFS

Sequence in context: A048950 A020229 A141350 * A190877 A293566 A293507

Adjacent sequences:  A235405 A235406 A235407 * A235409 A235410 A235411

KEYWORD

nonn

AUTHOR

R. H. Hardin, Jan 10 2014

STATUS

approved

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Last modified August 18 04:50 EDT 2019. Contains 326072 sequences. (Running on oeis4.)