4702880

Appears in sequences

• a(n) = A026615(2*n, n).at n=12A026616
• a(n) = A026615(n, floor(n/2)).at n=24A026621
• 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=24A052207