227045

Appears in sequences

• a(n) = Sum_{k=0..floor(n/4)} C(n-2*k,2*k)*2^k.at n=23A098575
• Number of nX2 0..4 arrays with values 0..4 introduced in row major order and each element equal to at least one horizontal or vertical neighbor.at n=7A198702
• T(n,k) = Number of n X k 0..4 arrays with values 0..4 introduced in row major order and each element equal to at least one horizontal or vertical neighbor.at n=37A198708
• T(n,k) = Number of n X k 0..4 arrays with values 0..4 introduced in row major order and each element equal to at least one horizontal or vertical neighbor.at n=43A198708
• a(n) = Sum_{k=0..floor(n/2)} 2^k * binomial(2*n-2*k+1,2*k).at n=11A387624