a(1) = 0
a(2) = 1
a(2*N) = sqrt(a(2*N-1)*a(2*N+1))
a(2*N+1) = (a(2*N)+a(2*N+2))/2
given n return a(n)
The two recursion equations are mixed up.
Project Euler: Problem 6, Natural numbers, squares and sums.
Find the sum of the elements in the "second" diagonal
Permute diagonal and antidiagonal
Magic is simple (for beginners)
Best Problem Elections
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