A184769 Number of (n+1)X6 0..3 arrays with every 2X2 subblock singular

73288, 27993232, 1444491280, 267277851856, 22101775999696, 3063406967117776, 308462363918463952, 38088784754633618128, 4147681118591532446416, 489192384756554775330256, 54923301389754187275076048

Offset

1,1

Comments

Column 5 of A184773

Links

R. H. Hardin, Table of n, a(n) for n = 1..200

Formula

Empirical: a(n)=269*a(n-1)-18604*a(n-2)-924484*a(n-3)+172021970*a(n-4)-5317125802*a(n-5)-240644036068*a(n-6)+18315084539348*a(n-7)-176828351479993*a(n-8)-15251096945742171*a(n-9)+468969932821527864*a(n-10)+423816748106440680*a(n-11)-220194036707645621952*a(n-12)+3011341305097414924416*a(n-13)+19582053443675695521792*a(n-14)-828980845602116625865728*a(n-15)+5735250851466806177918976*a(n-16)+37237275376312329872805888*a(n-17)-769694345371364662562881536*a(n-18)+3640059294890819989078573056*a(n-19)+6546764792569404029310074880*a(n-20)-138894044476327572267652349952*a(n-21)+612902096956692422783284543488*a(n-22)-1262133089431101071140658872320*a(n-23)+1116871598603441937042892652544*a(n-24)-65595149009308503731758694400*a(n-25)-293649242721509636655022080000*a(n-26)

Example

Some solutions for 3X6
..0..0..1..0..2..3....0..0..3..2..3..3....0..0..0..1..0..3....0..0..2..0..2..2
..0..0..1..0..0..0....0..0..0..0..0..0....0..0..0..1..0..2....0..0..0..0..2..2
..0..0..1..0..2..2....0..0..0..1..1..3....0..0..0..3..0..3....0..0..0..0..3..3

Crossrefs

Sequence in context: A237701 A023185 A244254 * A242805 A250838 A365309

Adjacent sequences: A184766 A184767 A184768 * A184770 A184771 A184772

Keyword

nonn

Author

R. H. Hardin Jan 21 2011

Status

approved