315000

Appears in sequences

• sec(arctan(x)+arcsin(x))=1+4/2!*x^2+72/4!*x^4+3510/6!*x^6+315000/8!*x^8...at n=4A012995
• Primal codes of canonical finite permutations on positive integers.at n=18A109299
• Triangular array: the fusion of polynomial sequences P and Q given by p(n,x)=(x+2)^n and q(n,x)=(x+2)^n.at n=40A193726
• Mirror of the triangle A193726.at n=40A193727
• Number of length 1+3 0..n arrays with no four consecutive terms having the sum of any three elements equal to three times the fourth.at n=22A249291
• Base-10 complementary numbers: n equals the product of the 10's complement of its digits.at n=17A294090
• Numbers with exactly four distinct exponents in their prime factorization, or four distinct parts in their prime signature.at n=30A323025
• Triangle read by rows: T(n,k) is the number of labeled forests with n trees and 2n nodes and with the largest tree having exactly k nodes, (n >= 1, 2 <= k <= n+1).at n=13A332959
• a(n) = sigma(n) * A276086(n), pointwise product of the sum of divisors function and the primorial base exp-function.at n=27A351252
• A(m, n) = lcm_{p in Partitions(n)} (Product_{r in p}(r + m)). Array read by ascending antidiagonals, for m, n >= 0.at n=40A368116