OFFSET
0,1
LINKS
MATHEMATICA
RecurrenceTable[{a[0]==-2, a[1]==1, a[n+2]==(2n+3)a[n+1]+(n+1)^2 a[n]}, a, {n, 20}] (* Harvey P. Dale, Dec 31 2017 *)
CROSSREFS
KEYWORD
sign,easy
AUTHOR
N. J. A. Sloane, May 26 2000
EXTENSIONS
More terms from James A. Sellers, May 27 2000
STATUS
approved