30685

Appears in sequences

• Numbers whose base-4 representation contains exactly four 1's and four 3's.at n=23A045133
• a(n) = K_3(n) = Sum_{k>=0} A090285(3,k)*2^k*binomial(n,k). a(n) = (4*n^3+30*n^2+56*n+15)/3.at n=26A090294
• Number of walks from (0,0) to (n,n) in the region 0 <= x-y <= 3 with the steps (1,0), (0, 1), (2,0) and (0,2).at n=8A127617
• In triangular peg solitaire, number of distinct feasible pairs starting with one peg missing and finishing with one peg.at n=36A130515
• In triangular peg solitaire, number of distinct solvable feasible pairs starting with one peg missing and finishing with one peg.at n=36A130516
• a(n) = (4*n+9)*n^2.at n=19A258618
• Unary-binary representation of Stern polynomials: a(n) = A156552(A260443(n)).at n=51A277020
• Odd bisection of A277020: a(n) = A277020(2n+1).at n=25A277189
• Numbers k such that sopfr(k + sopfr(k)) = sopfr(k) + sopfr(sopfr(k)), where sopfr = A001414.at n=32A376851