A236612 Number of (n+1)X(2+1) 0..2 arrays colored with the maximum plus the upper median of every 2X2 subblock

390, 2586, 17114, 106184, 645208, 4152180, 26549772, 165983800, 1030960714, 6559482790, 41617435108, 261155702658, 1635429768844, 10351073058430, 65443794339874, 411533381973194, 2586183990959816, 16330252501785100

Offset

1,1

Comments

Column 2 of A236618

Links

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

Formula

Empirical: a(n) = 4*a(n-2) +43*a(n-3) +968*a(n-4) +1219*a(n-5) +848*a(n-6) +1022*a(n-7) -59812*a(n-8) -48024*a(n-9) +199299*a(n-10) +34257*a(n-11) +110622*a(n-12) +235004*a(n-13) -1402148*a(n-14) +410643*a(n-15) +1245654*a(n-16) -1480077*a(n-17) +2710856*a(n-18) -1245093*a(n-19) -2253045*a(n-20) +2250775*a(n-21) -4602803*a(n-22) +1885365*a(n-23) +2227221*a(n-24) -1911884*a(n-25) +2191380*a(n-26) -813800*a(n-27) -664553*a(n-28) +479557*a(n-29) -129361*a(n-30) +128225*a(n-31) -10056*a(n-32) -7436*a(n-33) +3464*a(n-34) -1712*a(n-35) +128*a(n-36) for n>40

Example

Some solutions for n=4
..0..1..2....2..2..0....0..1..2....1..0..2....2..0..1....0..1..2....2..0..0
..0..1..0....1..1..0....0..1..1....1..0..2....0..0..2....2..1..2....0..0..0
..0..0..1....0..0..0....2..0..0....0..0..1....1..2..1....2..1..0....0..0..2
..0..0..2....0..0..2....0..2..1....0..0..1....2..0..0....0..0..1....0..2..0
..2..1..2....2..0..1....0..1..2....2..0..0....1..0..0....0..1..2....2..0..0

Crossrefs

Sequence in context: A108573 A206653 A202429 * A332419 A207575 A318174

Adjacent sequences: A236609 A236610 A236611 * A236613 A236614 A236615

Keyword

nonn

Author

R. H. Hardin, Jan 29 2014

Status

approved