57003

Appears in sequences

• Denominators of continued fraction convergents to sqrt(214).at n=12A041399
• Denominators of continued fraction convergents to sqrt(856).at n=12A042653
• Map from binary trees of size n to the set of corresponding trivalent plane trees (tpt) represented as size 2n+1 general trees.at n=36A083930
• Number of preferential arrangements of n labeled elements when only k <= 3 ranks are allowed.at n=10A101052
• Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only in a 2X2 block with tail 1,1 1,2 1,3 2,2 2,3 in any orientation.at n=13A146050
• Second member of a pair of numbers occurring in the definition of 2-happy couples.at n=63A191863
• y-value of the smallest solution to 2*x^2 - p*y^2 = (-1)^((p+1)/4), p = A002145(n).at n=14A306619
• a(n) = exp(3) * Sum_{k>=0} (-3)^k*k^n/k!.at n=10A309084