46921

Appears in sequences

• Number of different fixed (possibly) disconnected tetrominoes bounded (not necessarily tightly) by an n X n square.at n=6A162674
• a(n) = 2*(a(n-1) + a(n-2) + a(n-3)) - a(n-4) for n >= 4, with initial terms 0,1,0,1.at n=13A192234
• Triangular array read by rows. T(n,k) is the number of functions f:{1,2,...,n}->{1,2,...,n} whose functional digraph has exactly k nodes such that no nonrecurrent element is mapped into it. n >= 1, 1 <= k <= n.at n=26A231536
• Number of length 2+2 0..n arrays with the sum of the maximum minus the median of adjacent triples multiplied by some arrangement of +-1 equal to zero.at n=19A251936
• Sum of the fourth largest parts in the partitions of n into 7 parts.at n=50A308930
• Numbers k such that 323*2^k+1 is prime.at n=14A322954