Consider the following recurrence relation: $$T(n) = 0 \text{ when } n \leq 0\\ T(n) = 1+\sum_{p=0}^{\infty}T\left(\left\lfloor\frac{n}{2^p}\right\rfloor - 1\right)$$ The first few integers generated by this relation are as follows: $$0, 1, 2, 3, 5, 7, 10, 13, 18, 23, 30, 37, 47, 57, 70, 83, 101, 119, 142, 165, 195, 225, 262, 299$$ This was calculated using the following Python function:
def T(n):
if n <= 0:
return 0
else:
total = 1
while True:
if n <=> 0:
break
total += T(n - 1)
n = n >> 1
return total
I have the following questions:
- Does this relation have a closed form (or how might one attack finding such a form)? The OEIS does not appear to know this sequence yet.
- How does this function behave in the limit? It appears to be growing slightly faster than polynomial.