35659200

Appears in sequences

• Number of sequences {s(i): i=0..n} such that |s(i)-s(i-1)|=1, i=1..n and s(i)=0 at four values of i, one of which is i=0.at n=27A052207
• a(n) = binomial(2n, n) + binomial(2n-1, n-1) + binomial(2n+1, n).at n=13A184937