19888

Appears in sequences

• Number of red-black rooted trees with n-1 internal nodes.at n=17A001131
• Number of terms in 6th derivative of a function composed with itself n times.at n=14A022816
• Numbers n such that 227*2^n-1 is prime.at n=19A050865
• Number of 2 X 2 non-singular integer matrices with entries from {0,...,n}.at n=11A062801
• Smallest multiple of 8 with digit sum n.at n=34A069536
• Numbers n of the form k + reverse(k) for exactly two k.at n=37A072040
• Numbers k such that numerator(Bernoulli(2*k)/(2*k)) is different from numerator(Bernoulli(2*k)/(2*k*(2*k-1))).at n=76A090495
• A triangular sequence of six back recursive polynomial that are Hermite H(x,n) like and alternating orthogonal on domain {-Infinity,Infinity} and weight function Exp[ -x^2/2]:k=6 P(x, n) = Sum[If[Mod[m, 2] == 1, (m + 1)*x^m*P(x, n - m), n^(m/2)*P(x, n - m)], {m, 1, k}].at n=52A138093
• Least number k such that A070635(k) = n.at n=32A138791
• Number of (n+2) X 3 binary arrays avoiding patterns 001 and 110 in rows, columns and nw-to-se diagonals.at n=26A202440
• Number of (w,x,y,z) with all terms in {1,...,n} and median=mean.at n=22A212133
• Number of (w,x,y,z) with all terms in {1,...,n} and w+|x-y|<=|x-z|+|y-z|.at n=33A212691
• Number of (n+1)X(1+1) 0..3 arrays with the maximum plus the upper median plus the minimum of every 2X2 subblock equal.at n=3A236904
• Number of (n+1)X(4+1) 0..3 arrays with the maximum plus the upper median plus the minimum of every 2X2 subblock equal.at n=0A236907
• T(n,k)=Number of (n+1)X(k+1) 0..3 arrays with the maximum plus the upper median plus the minimum of every 2X2 subblock equal.at n=6A236911
• T(n,k)=Number of (n+1)X(k+1) 0..3 arrays with the maximum plus the upper median plus the minimum of every 2X2 subblock equal.at n=9A236911
• Number of partitions of n such that (least part) < (multiplicity of greatest part).at n=48A240178