OFFSET
1,2
REFERENCES
M. Schork, On the combinatorics of normal ordering bosonic operators and deforming it, J. Phys. A 36 (2003) 4651-4665.
FORMULA
a(n) = -sum(((-1)^k)*(fallfac(k, 5)^n)/k!, k=5..infinity)*exp(1), with fallfac(k, 5)=A008279(k, 5)=product(k+1-r, r=1..5) and n>=1. This produces also a(0)=-1.
CROSSREFS
KEYWORD
sign,easy
AUTHOR
Wolfdieter Lang, Dec 01 2003
STATUS
approved