1968128

Appears in sequences

• Triangle read by rows: T(n,k) = number of rational (+1,-1) matrices of rank k (n >= 1, 1 <= k <= n).at n=16A064231
• Sum of cubes of the first n even numbers (A016743).at n=31A254371
• Numbers of the form 2^(2*p+1)*M_p^2, where M_p is a Mersenne prime, A000668, with Mersenne exponent p, A000043.at n=2A330817
• "Late birds" in A390939: terms A390939(m) such that A390939(k) > A390939(m) for all k > m, where A390939 lists the keys added in the map initialized with T[1] = 1 and then repeatedly T[v] := k + (T[v] if defined else 0) for all key-value pairs (k, v) in T.at n=27A390941