247456

Appears in sequences

• Doubly triangular numbers: a(n) = n*(n+1)*(n^2+n+2)/8.at n=37A002817
• Array read by antidiagonals: T(n,k)=T(n,k-1)*(T(n,k-1)+k-1)/k with T(n,1)=n.at n=30A061315
• Triangular numbers which are 8-almost primes.at n=24A076582
• Triangular array: rows are the f-vectors of simplicial complexes dual to permutohedra of type D_n.at n=38A145902
• Triangular numbers whose sum of triangular divisors is also triangular and greater than 1.at n=7A209310
• Sequence of coefficients of x^1 in marked mesh pattern generating function Q_{n,132}^(0,4,0,0)(x).at n=31A212347
• a(n) = (m(n)^2 + 3)*(m(n)^2 + 7)/32, where m(n) = 2*n - 1.at n=26A336535