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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
OFFSET
1,1
COMMENTS
Column 3 of A235413
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: A329705 A020229 A141350 * A361703 A190877 A361636
KEYWORD
nonn
AUTHOR
R. H. Hardin, Jan 10 2014
STATUS
approved