37442161domain: NAppears in sequencesEuler characteristics of polytopes.at n=28A006481a(n) = (Lucas(6*n) - 2)/16.at n=7A049683Squares of the form 5n*(n-1)+1.at n=3A062788Alternating row sums of A257241, Stifel's version of the arithmetical triangle.at n=28A258144a(n) = binomial(2*n, n+1) + 1.at n=14A323229