A236620 Number of (n+1)X(1+1) 0..3 arrays colored with the maximum plus the lower median of every 2X2 subblock

256, 2624, 26560, 272160, 2793840, 28623360, 293206144, 3004474720, 30787484400, 315466604800, 3232443987328, 33121714435232, 339386917161584, 3477578105724160, 35633504005053312, 365123791082829024

Offset

1,1

Comments

Column 1 of A236624

Links

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

Formula

Empirical: a(n) = 304*a(n-3) +4012*a(n-4) +21408*a(n-5) +131544*a(n-6) +480256*a(n-7) +1095762*a(n-8) +2382528*a(n-9) -7588872*a(n-10) -47015904*a(n-11) -158803396*a(n-12) -569595744*a(n-13) -679250552*a(n-14) -333197568*a(n-15) +2056975591*a(n-16) +18914327296*a(n-17) +34799954216*a(n-18) +64591344816*a(n-19) +115113338336*a(n-20) -23416566272*a(n-21) -143590120832*a(n-22) -350090976000*a(n-23) -1031067717376*a(n-24) -1144206867456*a(n-25) -1239076647936*a(n-26) -1669973962752*a(n-27) -1104748867584*a(n-28) -692833222656*a(n-29) -631651958784*a(n-30) -206009008128*a(n-31)

Example

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

Crossrefs

Sequence in context: A235559 A235556 A236624 * A236505 A236501 A235752

Adjacent sequences: A236617 A236618 A236619 * A236621 A236622 A236623

Keyword

nonn

Author

R. H. Hardin, Jan 29 2014

Status

approved