8817900

Appears in sequences

• a(n) = (5*n)!/((3*n)!*n!*n!).at n=4A001451
• Smallest triangular number divisible by exactly n triangular numbers.at n=26A076983
• a(n) = binomial(n+4,4) * binomial(n+8,4).at n=12A104475
• Triangular numbers that can be represented as a product of two triangular numbers greater than 1, and as a product of three triangular numbers greater than 1.at n=29A295769
• Triangle read by rows: T(n,k) is the numerator of R(n,k) defined implicitly by the identity Sum_{i=0..l-1} Sum_{j=0..m} R(m,j)*(l-i)^j*i^j = l^(2*m+1) holding for all l,m >= 0.at n=49A302971
• Irregular triangle T giving the coefficients of x^n = x^{2*e2 + 3*e3} of (1 + x^2 + x^3)^n, with the pair of nonnegative numbers [e2, e3] listed in row n of A321201, for n >= 2.at n=40A321203