170016

Appears in sequences

• Maximal number of 165432 patterns in a permutation of 1,2,...,n.at n=27A100356
• If X_1,...,X_n is a partition of a 2n-set X into 2-blocks then a(n) is equal to the number of 4-subsets of X containing none of X_i, (i=1,...,n).at n=20A130810
• Number of binary strings of length n with no substrings equal to 0101, 0110, or 1001.at n=23A164508
• a(1) = 1; for n > 1, a(n) = sigma(sum of the previous terms) where sigma(k) = sum of the divisors of k.at n=17A165929
• Numbers with prime factorization pqrst^5.at n=27A190383
• a(n) = (n-3)*(n-2)*(n-1)*n*(n+1)/30.at n=23A210569
• Number of integer-sided hexagons having perimeter n, modulo rotations but not reflections.at n=40A293823
• a(n) = (n^2 - 3*n + 6)*binomial(n+2,3)/4.at n=21A301973
• a(n) is the lowest nonnegative exponent k such that n!^k is the product of the divisors of n!.at n=24A344687