OFFSET
0,3
COMMENTS
A133602 is a companion sequence.
FORMULA
A133566 * A000108 where A133566 = an infinite lower triangular matrix and A000108 = the Catalan sequence. For odd n, a(n) = C(n). For even n, a(n) = C(n) + C(n-1) = A005807(n-1).
Conjecture: n*(n-2)*(3*n-1)*(n+1)*a(n) -8*n*(2*n-3)*a(n-1) -4*(n-1)*(3*n+2)*(
2*n-3)*(2*n-5)*a(n-2)=0. - R. J. Mathar, Jun 20 2015
EXAMPLE
a(5) = C(5) = 42.
a(6) = 174 = C(6) + C(5) = 132 + 42.
MAPLE
A133603 := proc(n)
end proc: # R. J. Mathar, Jun 20 2015
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Gary W. Adamson, Sep 18 2007
STATUS
approved