85905

Appears in sequences

• a(n+1) = Sum_{k=0..floor(n/4)} a(k) * a(n-k).at n=22A030034
• Nearest integer to ratio of volume of n-dimensional cube of side 2 to volume of n-dimensional ball of radius 1.at n=15A057649
• Floor of ratio of volume of n-dimensional cube of side 2 to volume of n-dimensional ball of radius 1.at n=15A072168
• a(1)=1, a(n) = least odd triangular number which is a proper multiple of a(n-1).at n=5A088108
• Row sums of triangle A093922.at n=28A093925
• Smith triangular numbers.at n=15A098840
• Triangular numbers for which the sum of the digits is a cube.at n=28A117803
• 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), (0, 0, 1), (0, 1, -1), (1, 0, 0), (1, 1, -1)}.at n=9A150115
• Numbers k such that sigma_2(k)*sigma_1(k)/sigma_0(k) is a perfect square.at n=15A152218
• Least triangular number of the form p*triangular(n) where p is a prime number, or 0 if no such triangular number exists.at n=45A225789
• Numbers that start a run of four consecutive triangular numbers with four distinct prime factors.at n=19A349773
• Coefficient of x^n in the expansion of ( (1+x)^2 * (1+x+x^2)^3 )^n.at n=5A370172