[r-t] Wraps of Rounds

[Mark Davies]

Don, easier to get this from the unsimplified form:

if W(2N) = f(N) + 2f(N+1) - 3

then W(2N-1) = 2f(N+1) - 3

W(5) = 7
W(7) = 13
W(9) = 23
W(11) = 39

MBD