18677

Appears in sequences

• Number of trees of diameter 6.at n=12A000251
• Fibonacci sequence beginning 1, 30.at n=15A022400
• Expansion of sin(x)*sin(sin(x))/2.at n=5A024270
• Expansion of (x/(1-x))*sqrt((1+x)/(1-3*x)).at n=10A025577
• Discriminants of real quadratic fields with class number 1 and related continued fraction period length of 24.at n=51A051965
• Number of oriented prime alternating tangles.at n=7A104252
• Coefficients of the A-Dyson Mod 27 identity.at n=37A104501
• Number of ways to place zero or more nonadjacent 1,1 2,0 2,1 2,2 3,1 3,3 4,2 4,3 polyhexes in any orientation on a planar nXnXn triangular grid.at n=7A155361
• Nonhomogeneous three-term sequence a(n) = a(n-1) + a(n-2) + n.at n=17A179991
• Number of tilings of a 4 X n rectangle using integer-sided rectangular tiles of equal area.at n=10A220770
• Number of tilings of a 10 X n rectangle using integer-sided rectangular tiles of equal area.at n=4A220776
• Numbers n such that n, p=prime(n) and q=prime(p) have the same sum of digits.at n=32A261142
• Numbers k such that k![4] - 32 is prime, where k![4] = A007662(k) = quadruple factorial.at n=26A329167