A253373 Number of (n+1)X(6+1) 0..2 arrays with every 2X2 subblock sum nondecreasing horizontally, vertically and antidiagonally ne-to-sw

192474, 5125790, 128407497, 943840336, 8802760516, 35861948220, 195248382407, 603872541953, 2460650244362, 6637744193434, 23012704637795, 58052679772449, 183749552429663, 451122697387310, 1359093142879312, 3331941489554261

Offset

1,1

Comments

Column 6 of A253375

Links

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

Formula

Empirical: a(n) = 9*a(n-1) +18*a(n-2) -390*a(n-3) +363*a(n-4) +7557*a(n-5) -16924*a(n-6) -85080*a(n-7) +289038*a(n-8) +592626*a(n-9) -3022596*a(n-10) -2302692*a(n-11) +22010974*a(n-12) +263586*a(n-13) -118108608*a(n-14) +60625464*a(n-15) +480363315*a(n-16) -453795339*a(n-17) -1497838078*a(n-18) +2041953882*a(n-19) +3566209239*a(n-20) -6619257735*a(n-21) -6304597140*a(n-22) +16357594512*a(n-23) +7550240128*a(n-24) -31527338352*a(n-25) -3791317152*a(n-26) +47758481952*a(n-27) -6659648352*a(n-28) -56728278048*a(n-29) +20129722880*a(n-30) +52207707264*a(n-31) -28856183808*a(n-32) -36302235648*a(n-33) +27669476352*a(n-34) +18144427008*a(n-35) -18828638464*a(n-36) -5799153408*a(n-37) +9055982592*a(n-38) +719677440*a(n-39) -2944438272*a(n-40) +244629504*a(n-41) +582598656*a(n-42) -119439360*a(n-43) -53084160*a(n-44) +15925248*a(n-45) for n>67

Example

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

Crossrefs

Sequence in context: A253522 A254420 A254427 * A204228 A270971 A234455

Adjacent sequences: A253370 A253371 A253372 * A253374 A253375 A253376

Keyword

nonn

Author

R. H. Hardin, Dec 30 2014

Status

approved