OFFSET
1,1
COMMENTS
Column 2 of A200990
LINKS
R. H. Hardin, Table of n, a(n) for n = 1..210
FORMULA
Empirical: a(n) = 5*a(n-5) -10*a(n-10) +10*a(n-15) -5*a(n-20) +a(n-25)
Subsequences for n modulo 5 = 1,2,3,4,0:
p=(n+4)/5: a(n) = (115/6)*p^4 - 11*p^3 + (11/6)*p^2
q=(n+3)/5: a(n) = (115/12)*q^4 + (1/2)*q^3 - (1/12)*q^2
r=(n+2)/5: a(n) = (115/12)*r^4 + (49/6)*r^3 + (23/12)*r^2 + (1/3)*r
s=(n+1)/5: a(n) = (115/6)*s^4 + 35*s^3 + (125/6)*s^2 + 4*s
t=(n+0)/5: a(n) = (23/12)*t^4 + (37/6)*t^3 + (91/12)*t^2 + (13/3)*t + 1
EXAMPLE
Some solutions for n=3
..0..1....0..2....0..1....0..3....0..2....0..1....0..1....0..2....0..2....0..2
..1..2....1..3....2..3....1..3....1..3....0..3....0..2....1..3....0..3....1..3
..3..4....4..4....2..4....2..4....2..4....2..4....3..4....3..4....1..4....1..4
CROSSREFS
KEYWORD
nonn
AUTHOR
R. H. Hardin Nov 25 2011
STATUS
approved