A224202 Number of nX6 0..3 arrays with rows unimodal and antidiagonals nondecreasing.

610, 59792, 2734683, 93052770, 2981774784, 96914926654, 3202561268692, 106630751360602, 3558964686578544, 118857103988506092, 3969834734632962762, 132593577206338949766, 4428640833523450577612, 147916669230853276174408

Offset: 1

Author

R. H. Hardin Apr 01 2013

Keywords

• nonn

Comments

Column 6 of A224204

Examples

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

Links

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

Formula

Empirical: a(n) = 84*a(n-1) -2771*a(n-2) +49004*a(n-3) -526214*a(n-4) +3641009*a(n-5) -16632719*a(n-6) [phone]*a(n-7) -53423733*a(n-8) -313959977*a(n-9) [phone]*a(n-10) -7086418537*a(n-11) [phone]*a(n-12) [phone]*a(n-13) -20279410782*a(n-14) [phone]*a(n-15) [phone]*a(n-16) [phone]*a(n-17) [phone]*a(n-18) [phone]*a(n-19) [phone]*a(n-20) [phone]*a(n-21) [phone]*a(n-22) [phone]*a(n-23) [phone]*a(n-24) [phone]*a(n-25) for n>32