OFFSET
0,2
COMMENTS
Apply the inverse of the Riordan array (1/(1-x^2),x/(1+x)^2) to 4^n. Hankel transform is A070997.
FORMULA
Conjecture: +4*(n+1)*a(n) +(-81*n+23)*a(n-1) +10*(51*n-70)*a(n-2) +500*(-2*n+5)*a(n-3)=0. - R. J. Mathar, Feb 05 2015
Conjecture: +4*(n+1)^2*a(n) +(-41*n^2-58*n+23)*a(n-1) +50*(n+2)*(2*n-3)*a(n-2)=0. - R. J. Mathar, Feb 05 2015
CROSSREFS
KEYWORD
easy,nonn
AUTHOR
Paul Barry, Mar 13 2009
STATUS
approved