26899040

Appears in sequences

• The number of even permutations p of 1,2,...,n such that -1<=p(i)-i<=2 for i=1,2,...,n.at n=29A268306
• Number of length-n binary vectors beginning with 0, ending with 1, and avoiding 4 consecutive 0's and 4 consecutive 1's.at n=30A283834