The equation should be
a n + 4 = − 1 ( n + 4 ) ( n + 3 ) a n n = 0 , 1 , 2 , … {\displaystyle a_{n+4}={\frac {-1}{(n+4)(n+3)}}a_{n}\qquad n=0,1,2,\ldots }
Return to errata.
