OFFSET
1,2
LINKS
Joe Buhler and R. L. Graham, Juggling Drops and Descents, Amer. Math. Monthly, 101, (no. 6) 1994, 507 - 519.
MAPLE
[seq(Z2N(N2Z(n)-TZ2(abs(N2Z(n)))), n=1..120)];
N2Z := n -> ((-1)^n)*floor(n/2); Z2N := z -> 2*abs(z)+`if`((z < 1), 1, 0);
CROSSREFS
KEYWORD
nonn
AUTHOR
Antti Karttunen, Oct 19 2001
STATUS
approved