3381300

Appears in sequences

• Let T(n) = n(n+1)/2 be the n-th triangular number (A000217); a(n) = T(8T(n)).at n=25A185096
• Triangular numbers that are the product of a triangular number and a square number (both greater than 1).at n=26A253650
• Triangular numbers with tetrahedral indices: a(n) = (1/72) * (n*(n+1)*(n+2)*(n+3)*(n^2+2)).at n=24A373733
• Expansion of (1/x) * Series_Reversion( x / (1 + x^4 * (1 + x)^2) ).at n=27A389130