OFFSET
0,2
FORMULA
C(2n+2, n)-[n even]*C(n+1, n/2). - Ralf Stephan, Mar 19 2004
Conjecture: -(n+2)*(n-1)*a(n) +2*(n+1)*(3*n-4)*a(n-1) +4*(-n^2+5*n-1)*a(n-2) -8*n*(3*n-4)*a(n-3) +16*(n-1)*(2*n-5)*a(n-4)=0. - R. J. Mathar, May 20 2013
CROSSREFS
KEYWORD
nonn
AUTHOR
STATUS
approved