21444

Appears in sequences

• a(n) = s(1)t(n) + s(2)t(n-1) + ... + s(k)t(n-k+1), where k = [ n/2 ], s = (odd natural numbers), t = (primes).at n=31A025117
• Number of right triangles on a (n+1) X 4 grid.at n=38A189808
• 1-sequence of reduction of (3n-2) by x^2 -> x+1.at n=13A192312
• Number of steps needed to reach position "YZ^(n-1)" in the Towers of Hanoi exchanging disks puzzle with 3 pegs and n disks.at n=16A341580
• a(n) = coefficient of x^n in A(x) such that: 1 = Sum_{n=-oo..+oo} x^n * (A(x) - x^(4*n+3))^(n-1).at n=7A358963