A223678 Number of nX6 0..1 arrays with rows and antidiagonals unimodal.

22, 484, 7745, 105995, 1363639, 17068664, 210660192, 2577807779, 31402790284, 381690187059, 4633795630120, 56218000664764, 681802614308980, 8267243693472174, 100235088136900011, 1215221703756846658

Offset: 1

Author

R. H. Hardin Mar 25 2013

Keywords

• nonn

Comments

Column 6 of A223680

Examples

			Some solutions for n=3
..0..1..1..1..1..0....1..0..0..0..0..0....0..0..1..1..1..1....0..0..0..1..0..0
..0..1..1..0..0..0....0..0..0..0..1..1....0..0..0..0..0..1....0..1..1..0..0..0
..1..0..0..0..0..0....0..0..0..0..1..1....0..0..0..0..1..0....0..1..1..1..1..0
		

Links

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

Formula

Empirical: a(n) = 22*a(n-1) -151*a(n-2) +461*a(n-3) -797*a(n-4) -4885*a(n-5) +28261*a(n-6) +53750*a(n-7) -398208*a(n-8) +360701*a(n-9) +952132*a(n-10) -5152120*a(n-11) +7572284*a(n-12) +6140578*a(n-13) -18089482*a(n-14) -653352*a(n-15) [phone]*a(n-16) [phone]*a(n-17) -392210630*a(n-18) [phone]*a(n-19) -875602031*a(n-20) [phone]*a(n-21) -930560603*a(n-22) [phone]*a(n-23) -1035189626*a(n-24) [phone]*a(n-25) -1842818297*a(n-26) [phone]*a(n-27) -2217424297*a(n-28) [phone]*a(n-29) -832569368*a(n-30) [phone]*a(n-31) -308789168*a(n-32) [phone]*a(n-33) -122269952*a(n-34) [phone]*a(n-35) -2822400*a(n-36)