OFFSET
1,2
COMMENTS
Column 5 of A202756.
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = (1/302400)*n^10 + (1/10080)*n^9 + (1/1008)*n^8 + (1/336)*n^7 - (67/14400)*n^6 + (7/480)*n^5 + (1021/6048)*n^4 - (145/1008)*n^3 + (10519/12600)*n^2 - (367/420)*n + 1.
Conjectures from Colin Barker, Jun 01 2018: (Start)
G.f.: x*(1 - 6*x + 31*x^2 - 47*x^3 + 110*x^4 - 162*x^5 + 140*x^6 - 79*x^7 + 31*x^8 - 8*x^9 + x^10) / (1 - x)^11.
a(n) = 11*a(n-1) - 55*a(n-2) + 165*a(n-3) - 330*a(n-4) + 462*a(n-5) - 462*a(n-6) + 330*a(n-7) - 165*a(n-8) + 55*a(n-9) - 11*a(n-10) + a(n-11) for n>11.
(End)
EXAMPLE
Some solutions for n=5:
..0..0..0..0..0....0..0..0..0..0....0..0..0..0..0....0..0..0..0..0
..0..1..1..1..1....0..0..0..0..0....0..0..1..1..1....0..0..0..0..1
..0..1..1..1..2....0..0..0..1..1....0..1..1..1..1....0..0..0..0..1
..0..1..1..2..3....0..0..0..1..2....0..1..1..2..2....0..1..1..1..1
..0..1..2..3..4....0..0..1..1..2....0..1..2..2..2....0..1..1..2..2
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin, Dec 23 2011
STATUS
approved