A221444 Hilltop maps: number of nX6 binary arrays indicating the locations of corresponding elements not exceeded by any horizontal or antidiagonal neighbor in a random 0..1 nX6 array

31, 1577, 76055, 3669101, 177320895, 8569227073, 414116287743, 20012580804813, 967127817426727, 46737411242830049, 2258631763028702151, 109150620595639469645, 5274812021536486627631, 254910523741875128561121

Offset

1,1

Comments

Column 6 of A221446

Links

R. H. Hardin, Table of n, a(n) for n = 1..62

Formula

Empirical: a(n) = 31*a(n-1) +737*a(n-2) +4637*a(n-3) +10078*a(n-4) +3446*a(n-5) -14110*a(n-6) -4246*a(n-7) -1045*a(n-8) +11211*a(n-9) -13907*a(n-10) +5385*a(n-11) -2232*a(n-12) +16*a(n-13) for n>15

Example

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

Crossrefs

Sequence in context: A130661 A187701 A185512 * A185665 A183883 A049081

Adjacent sequences: A221441 A221442 A221443 * A221445 A221446 A221447

Keyword

nonn

Author

R. H. Hardin Jan 17 2013

Status

approved