18129

Appears in sequences

• a(0) = 0, a(1) = 1, a(n+1) = 2*a(n) + (2*n-1)^2*a(n-1).at n=6A072371
• Triangle read by rows: T(n, k) = Sum_{j=0..k} (-1)^j*binomial(n, j)*(k + 1 - j)^(n - 1).at n=15A162498
• Semiprimes q such that q^2-4 and q^2+4 are also semiprimes.at n=15A173084
• Numbers n such that n!10 + 2 is prime.at n=46A204657
• Number of partitions p of n such that 2*min(p) is not a part of p.at n=41A238594
• Number of permutations p of [n] with no fixed points and displacement of elements restricted by four: 1 <= |p(i)-i| <= 4.at n=10A259777
• Isolated deficient numbers that are divisible by 3.at n=26A273255
• Centered octahemioctahedral numbers: a(n) = (4*n^3+24*n^2+8*n+3)/3.at n=22A274974
• Number of ASCII letter 'A' bytes that when compressed with zlib generate a new record longest compressed byte stream.at n=33A375585