1,1

Column 3 of A207300

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

Empirical: a(n) = 72*a(n-1) -1686*a(n-2) +5072*a(n-3) +401103*a(n-4) -6241272*a(n-5) +15657512*a(n-6) +403835904*a(n-7) -3944527488*a(n-8) +8453431296*a(n-9) +64599109632*a(n-10) -475519942656*a(n-11) +1287747403776*a(n-12) -1583479259136*a(n-13) +701730127872*a(n-14) for n>46

Some solutions for n=4

..0..2..3..1....3..1..3..1....2..0..3..3....1..0..1..1....3..3..0..3

..1..2..2..3....2..0..1..3....0..0..3..3....2..0..3..3....2..1..0..3

..0..0..0..0....3..2..3..1....2..0..0..0....1..0..3..3....1..0..0..1

..2..2..3..0....2..3..2..1....1..0..0..2....3..0..1..1....2..2..0..0

..2..2..3..0....0..3..1..2....2..0..0..2....0..0..0..3....0..3..0..0

Sequence in context: A285993 A295453 A205022 * A151595 A254581 A254588

Adjacent sequences: A207294 A207295 A207296 * A207298 A207299 A207300

R. H. Hardin, Feb 16 2012

approved