65613

Appears in sequences

• a(n) = floor( n*(n-1)*(n-2)*(n-3)/27 ).at n=38A011937
• Numbers k such that binomial(3k, k) - 1 is prime.at n=29A125220
• 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, 0), (-1, 0, -1), (0, 1, 1), (1, 0, 0), (1, 0, 1)}.at n=8A151079
• Array: row n shows the coefficients of the characteristic polynomial of the n-th principal submatrix of {(i+j)*min(i,j)} (A203990).at n=22A203991
• Expansion of Product_{k>=1} 1/((1+x^k)*(1-x^k)^4).at n=15A262380