54920

Appears in sequences

• Number of acyclic tertiary alcohols with n carbon atoms.at n=11A005956
• Row sums of triangle A067330; also of triangle A067418.at n=14A067988
• A 2nd order recursion: a(1)=a(2)=1, a(n) = prime(a(n-2)) + pi(a(n-1)) = A000040(a(n-2)) + A000720(a(n-1)).at n=15A082095
• Number of nX3 arrays containing 3 copies of 0..n-1 with no equal vertical or antidiagonal neighbors and new values introduced sequentially from 0.at n=4A265678
• T(n,k)=Number of nXk arrays containing k copies of 0..n-1 with no equal vertical or antidiagonal neighbors and new values introduced sequentially from 0.at n=25A265679
• Number of 5Xn arrays containing n copies of 0..5-1 with no equal vertical or antidiagonal neighbors and new values introduced sequentially from 0.at n=2A265682