19054

Appears in sequences

• Coordination sequence for MgNi2, Position Mg2.at n=34A009935
• Initial pile sizes which guarantee a win for player 2 in a certain variant of Nim.at n=44A016741
• Fibonacci sequence beginning 2, 30.at n=15A022377
• Number of cycles in range [A014137(n-1)..A014138(n-1)] of permutation A071663.at n=13A079441
• a(n) = Sum_{i=0..n} digsum_3(i)^4, where digsum_3(i) = A053735(i).at n=59A231505
• a(n) = (a(n-1) * a(n-3) - (-1)^n * a(n-2)^2) / a(n-4) with a(1) = a(3) = a(4) = 1, a(2) = -2.at n=16A247378