27651

Appears in sequences

• Column 6 of triangle A055907.at n=7A055912
• a(-1) = 1, a(n) = Sum_{k=0..n} A034851(n,k)*a(k-1) where A034851(n,k) are entries in Losanitsch's triangle.at n=10A102814
• Number of n X 6 binary arrays with all 1s connected and a path of 1s from top row to bottom row.at n=2A163032
• Number of n X 3 binary arrays with all 1s connected and a path of 1s from left column to right column.at n=5A163038
• Number of ways to place two non-attacking rooks on all free n-ominoes.at n=8A171011
• Numbers n such that n*2^2203 - 1 is prime.at n=33A265503
• Decimal representation of the diagonal from the corner to the origin of the n-th stage of growth of the two-dimensional cellular automaton defined by "Rule 397", based on the 5-celled von Neumann neighborhood.at n=30A288010
• Array read by antidiagonals: T(m,n) is the number of m X n binary arrays with all 1's connected and a path of 1's from top row to bottom row.at n=30A359574