OFFSET
0,3
EXAMPLE
A(xA(2xA(3xA(4x)))) = 1 + x - 120x^5 + 5280x^6 - 192000x^7 +-...
A(xA(2xA(3xA(4xA(5x))))) = 1 + x - 720x^6 + 46800x^7 - 2332800x^8 +-...
A(xA(2xA(...(n-2)xA((n-1)x)))) = 1 + x - n!x^n + (n-1)(2n+1)n!x^(n+1) -+...
CROSSREFS
KEYWORD
sign
AUTHOR
Paul D. Hanna, Sep 26 2003
STATUS
approved