52713

Appears in sequences

• A089450 indexed by A000040.at n=22A089525
• Sum of lengths of initial and final horizontal segments over all dispersed Dyck paths of semilength n (i.e., over all Motzkin paths of length n with no (1,0)-steps at positive heights).at n=17A191531
• Number of (n+1)X(2+1) 0..1 arrays with no 2X2 subblock having zero or two 1s.at n=7A251213
• T(n,k)=Number of (n+1)X(k+1) 0..1 arrays with no 2X2 subblock having zero or two 1s.at n=37A251219
• Numbers k such that 2*10^k - 87 is prime.at n=28A273907