1998724

Appears in sequences

• a(n) = number of (s(0), s(1), ..., s(n)) such that s(i) is a nonnegative integer and |s(i) - s(i-1)| = 1 for i = 1,2,...,n and s(0) = 2. Also a(n) = sum of numbers in row n+1 of array T defined in A026009.at n=22A026010
• a(n) = binomial(2*n,n) - binomial(2*n-2,n-1); or (3n-2)*C(n-1), where C = Catalan numbers (A000108).at n=11A051924
• Sum of next n squares.at n=23A072474
• 12-dimensional square numbers.at n=11A266561
• a(n) is the number of ballot sequences of length n tied or won by at most 2 votes.at n=22A337499
• a(n) is the number of ballot sequences of length n tied or won by at most 3 votes.at n=22A337500