75701

Appears in sequences

• Numbers k such that the continued fraction for sqrt(k) has odd period and if the last term of the periodic part is deleted the two central terms are both 21.at n=32A031609
• a(n) = (2*n+1)*(4*n^2+4*n+3)/3.at n=30A057813
• Triangle read by rows: T(n,k) = the number of Dyck paths of semilength n with k UDDU's.at n=38A135306
• Triangular array read by rows. T(n,k) is the number of functions on n unlabeled nodes that have exactly k unique components (n >= 1, k >= 1).at n=51A217859
• Number of Dyck paths of semilength n having exactly one occurrence of the consecutive pattern UDDU.at n=12A244235