33481

Appears in sequences

• Numbers n such that (n + prime(n)), (n+1 + prime(n+1)), (n+2 + prime(n+2)) and (n+3 + prime(n+3)) are divisible by 5.at n=21A107582
• Number of n X n binary arrays symmetric under horizontal reflection with all ones connected only in a 1010-1111-1000 pattern in any orientation.at n=11A146643
• n^3 + 4*n^2 - 5*n + 1.at n=31A241577
• a(n) is the least k such that gcd(A006666(k), A006667(k)) = n.at n=36A281938
• Number of essentially series achiral series-parallel networks with n elements and without multiple unit elements in parallel.at n=19A339291
• E.g.f. A(x) satisfies A(x) = 1/( 1 - sinh(x) * A(x)^2 ).at n=5A381428