233268

Appears in sequences

• a(n) = 441*n^2 - 21.at n=22A145678
• Triangle read by rows, inverse Bell transform of the complementary Bell numbers (A000587); T(n,k) for n>=0 and 0<=k<=n.at n=49A264436
• Number of length-4 0..n arrays with no repeated value differing from the previous repeated value by one or less.at n=20A269607
• a(0) = 0, a(1) = 1, for n > 1, a(n) = a(n-1) + a(n-A002487(n)).at n=37A283474
• First differences of A283474.at n=39A283479