19910

Appears in sequences

• Numbers k such that 263*2^k-1 is prime.at n=14A050890
• Number of sequences of rooted identity trees with a total of n nodes.at n=13A052806
• a(1)=1, a(n)=a(n-1)+n^3 if n odd, a(n)=a(n-1)+ n^0 if n is even.at n=19A140152
• Monotonic ordering of set S generated by these rules: if x and y are in S then 3xy-x-y is in S, and 2 is in S.at n=15A192529
• Number of (n+2)X(2+2) 0..2 arrays with every 3X3 subblock row, column, diagonal and antidiagonal sum not equal to 1 3 or 4.at n=5A252082
• Number of (n+2)X(6+2) 0..2 arrays with every 3X3 subblock row, column, diagonal and antidiagonal sum not equal to 1 3 or 4.at n=1A252086
• T(n,k)=Number of (n+2)X(k+2) 0..2 arrays with every 3X3 subblock row, column, diagonal and antidiagonal sum not equal to 1 3 or 4.at n=22A252088
• T(n,k)=Number of (n+2)X(k+2) 0..2 arrays with every 3X3 subblock row, column, diagonal and antidiagonal sum not equal to 1 3 or 4.at n=26A252088
• Records in A171797 starting from a(1).at n=38A305396
• Number of ways to partition the set of vertices of a convex n-gon into non-intersecting directed polygons.at n=11A350599
• G.f.: Sum_{k>=0} 2^k * x^(k^2) / Product_{j=1..k} (1 - x^j).at n=48A376948