399331

Appears in sequences

• a(n) = a(n-1) + 3*a(n-2) for n > 1, a(0) = a(1) = 1.at n=16A006130
• a(n) = 3*a(n-2) - a(n-1) for n > 1, a(0) = 0, a(1) = 1.at n=17A182228
• Array read by antidiagonals for k,n>=0: T(n,k) = number of tilings of a 2k X n rectangle using dominos and 2 X 2 right triangles.at n=57A362297