OFFSET
2,2
FORMULA
C(2n, n-2) - C(2n, n-6). G.f.: (1+x^2C^4)*C^6, where C=(1-sqrt(1-4x))/(2x). - Ralf Stephan, Jan 09 2005
Conjecture: (n+6)*a(n) +10*(-n-4)*a(n-1) +2*(17*n+32)*a(n-2) +4*(-11*n+4)*a(n-3) +8*(2*n-5)*a(n-4)=0. - R. J. Mathar, Jun 22 2013
MATHEMATICA
Table[Binomial[2n, n-2]-Binomial[2n, n-6], {n, 2, 30}] (* Harvey P. Dale, May 28 2017 *)
CROSSREFS
KEYWORD
nonn
AUTHOR
STATUS
approved