31273

Appears in sequences

• a(n) = 2*a(n-1) + 7*a(n-2), with a(0) = 0, a(1) = 1.at n=9A015519
• Number of permutations satisfying -k<=p(i)-i<=r and p(i)-i not in I, i=1..n, with k=1, r=5, I={0,1,3}.at n=48A079957
• A linear combination of A008292 and A130595: t(n,m)=2*A008292(n,m)- A130595(n,m).at n=31A141903
• The number of tilings of an 8 X n floor with 1 X 4 tetrominoes.at n=16A236582