49205

Appears in sequences

• Eighth column of quintinomial coefficients.at n=11A064057
• Number of length n+3 0..4 arrays with every four consecutive terms having the sum of some three elements equal to three times the fourth.at n=40A248533
• a(n) = (3^n-1)*(n+1)/4.at n=8A261064
• Numbers k such that the equation x^2 - k*y^4 = -1 has a solution for which |y| > 2.at n=26A356488
• Numbers in whose base 3-representation every two consecutive digits and every three consecutive digits are distinct.at n=38A369635
• a(n) = Sum_{1 <= x_1, x_2, x_3, x_4 <= n} ( gcd(x_1, n)/gcd(x_1, x_2, x_3, x_4, n) )^3.at n=5A371628
• Triangle read by rows: T(n,k) is the number of sets of noncrossing paths of size k whose nodes are a subset of n nodes arranged in a circle with one node paths disallowed, 0 <= k <= floor(n/2).at n=31A390896