27913

Appears in sequences

• Dying rabbits: a(n) = a(n-1) + a(n-2) - a(n-12).at n=23A023442
• a(n) = floor(n!/sigma(n)).at n=8A062359
• O.g.f.: A(x) = Sum_{n>=0} x^n / Product_{k=0..n} (1 - k^2*x).at n=7A135920
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 1), (-1, 0, 0), (1, -1, 1), (1, 0, 1), (1, 1, -1)}.at n=9A148989
• Numbers for which the root mean square of nontrivial divisors is an integer and which are not a square of prime numbers.at n=37A247137
• a(n) = a(n-1) + a(n-2) + a(n-3), with a(0)=1, a(1)=4, a(2)=5.at n=16A354080
• Array read by downward antidiagonals: A(n,k) = (k+1)^2*A(n-1,k) + A(n-1,k+1) with A(0,k) = 1, n >= 0, k >= 0.at n=27A369527
• Array read by downward antidiagonals: A(n,k) = A(n-1,k+2) + Sum_{j=0..k} binomial(k,j)*A(n-1,j) with A(0,k) = 1, n >= 0, k >= 0.at n=27A369595