A185517 Number of (n+1)X6 0..2 arrays with every 2X2 subblock singular

10847, 1058503, 35659489, 2183297449, 96865190255, 5157904182519, 249246507105681, 12721664424927033, 630667351622299519, 31779395697846344999, 1587432658714531328833, 79681759021406117870025

Offset

1,1

Comments

Column 5 of A185521

Links

R. H. Hardin, Table of n, a(n) for n = 1..124

Formula

Empirical: a(n)=124*a(n-1)-4828*a(n-2)+9640*a(n-3)+4211198*a(n-4)-108674648*a(n-5)+428321452*a(n-6)+23596172360*a(n-7)-388971416381*a(n-8)+572244355004*a(n-9)+40557598916624*a(n-10)-386088931978704*a(n-11)+8157694824096*a(n-12)+19937500201681088*a(n-13)-107256141951991808*a(n-14)-112420856782623488*a(n-15)+3046625671768687360*a(n-16)-9264406533882734592*a(n-17)-12424668477383446528*a(n-18)+137806999333441568768*a(n-19)-276536454577537679360*a(n-20)-125316061156482220032*a(n-21)+1408091287365347180544*a(n-22)-2387876314993964089344*a(n-23)+1658731722007080075264*a(n-24)-273671360333161168896*a(n-25)-124425274583131619328*a(n-26)

Example

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

Crossrefs

Sequence in context: A065321 A252064 A295993 * A250954 A334003 A214243

Adjacent sequences: A185514 A185515 A185516 * A185518 A185519 A185520

Keyword

nonn

Author

R. H. Hardin Jan 29 2011

Status

approved