A236273 Number of (n+1)X(3+1) 0..2 arrays with the upper median unequal to the lower median in every 2X2 subblock

1048, 15434, 232736, 3604782, 56299040, 884625654, 13930389246, 219666732130, 3465756760168, 54697571104400, 863364488755858, 13628610245730708, 215140611062094002, 3396256121150879282, 53614426723942801722

Offset

1,1

Comments

Column 3 of A236278

Links

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

Formula

Empirical: a(n) = 23*a(n-1) -16*a(n-2) -2232*a(n-3) +7199*a(n-4) +81562*a(n-5) -305840*a(n-6) -1579897*a(n-7) +5702786*a(n-8) +18527773*a(n-9) -56010227*a(n-10) -138644483*a(n-11) +297115491*a(n-12) +656260628*a(n-13) -774956030*a(n-14) -1816063888*a(n-15) +616468708*a(n-16) +2397532500*a(n-17) +617130944*a(n-18) -763319696*a(n-19) -368062992*a(n-20) +11133168*a(n-21) +22287808*a(n-22) +1286144*a(n-23) -327168*a(n-24) -26624*a(n-25)

Example

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

Crossrefs

Sequence in context: A056092 A280809 A252307 * A251375 A281033 A337960

Adjacent sequences: A236270 A236271 A236272 * A236274 A236275 A236276

Keyword

nonn

Author

R. H. Hardin, Jan 21 2014

Status

approved