119808

Appears in sequences

• Expansion of 1/(1 - 2*x^2 - 2*x^3).at n=22A052907
• a(n)=4a(n-1)-4a(n-2)+4a(n-3).at n=11A099214
• Triangle read by rows: T(n,k) is the number of hill-free Dyck paths of semilength n, having k ascents of length at least 2 (1 <= k <= floor(n/2), n >= 2).at n=38A114593
• Numbers k such that sum of odd divisors of k equals sum of squares of primes dividing k.at n=22A252424
• Decimal representation of the x-axis, from the origin to the right edge, of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 379", based on the 5-celled von Neumann neighborhood.at n=18A281635
• a(n) = phi(5^n-1), where phi is Euler's totient function (A000010).at n=7A295502
• Expansion of e.g.f. ( (1/x) * Series_Reversion( x * exp(-x * (1 + x)^2) / (1 + x)^3 ) )^2.at n=4A380799