A235966 Number of (n+1)X(2+1) 0..3 arrays colored with the upper median value of each 2X2 subblock

1964, 16744, 119770, 856720, 6207010, 44922684, 325144432, 2361022844, 17119474440, 124220037442, 901411171700, 6541404674180, 47455915679480, 344384422869056, 2499060418302142, 18133500864283732, 131575224210238262

Offset

1,1

Comments

Column 2 of A235972

Links

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

Formula

Empirical: a(n) = 160*a(n-3) +1405*a(n-4) +2240*a(n-5) +5011*a(n-6) -47892*a(n-7) -167088*a(n-8) -266910*a(n-9) -62360*a(n-10) +1453816*a(n-11) +3423362*a(n-12) +2700096*a(n-13) -2875681*a(n-14) -1353448*a(n-15) +2584789*a(n-16) -4251920*a(n-17) -8824295*a(n-18) +685061*a(n-19) +4397856*a(n-20) +158216*a(n-21) +4986700*a(n-22) +129756*a(n-23) +547072*a(n-24) +96320*a(n-25) -215488*a(n-26) -16688*a(n-27) -35392*a(n-28) -9216*a(n-29) for n>34

Example

Some solutions for n=3
..2..1..1....1..0..1....0..2..3....1..2..3....2..3..1....0..1..2....1..0..2
..3..0..0....0..3..2....2..1..3....1..2..3....0..0..3....0..2..1....1..2..1
..3..0..3....0..2..3....0..0..2....0..1..0....1..0..1....2..0..0....3..0..1
..2..1..0....0..0..0....3..0..1....3..3..0....2..3..3....1..0..3....3..3..2

Crossrefs

Sequence in context: A159213 A056094 A253528 * A252380 A251023 A193312

Adjacent sequences: A235963 A235964 A235965 * A235967 A235968 A235969

Keyword

nonn

Author

R. H. Hardin, Jan 17 2014

Status

approved