549120

Appears in sequences

• Coefficients of Chebyshev T polynomials: a(n) = A053120(n+12, n), n >= 0.at n=8A006976
• cosh(sinh(x)*arcsin(x))=1+12/4!*x^4+240/6!*x^6+8400/8!*x^8...at n=5A012542
• Numbers k such that the least term in the periodic part of the continued fraction for sqrt(k) is 38.at n=38A031716
• Number of permutations satisfying -k<=p(i)-i<=r and p(i)-i not in I, i=1..n, with k=3, r=3, I={-1,0,1}.at n=27A079985
• Riordan array (1-u, u) where u=(-1 + sqrt(1+8*x))/4.at n=46A110292
• a(n) = 1521*n^2 + 39.at n=19A158768
• a(n) is the number of associate Rota-Baxter words in one idempotent generator x and one idempotent operator P of degree n. Such words are Rota-Baxter words that begin and/or end with x, and P is applied n times in the word.at n=8A181282
• Numerators of the Diophantus-Dujella rational Diophantine quintuple: 1 + the product of any two distinct terms is a square.at n=4A192631
• Number of subsets of {1..n} such that no two elements have the same sorted prime signature.at n=37A326438
• Numbers k such that A051378(k) > 2*k and A333926(k) <= 2*k.at n=7A349284
• a(n) = (9*n)!*(5*n/2)!*(3*n/2)!/((5*n)!*(9*n/2)!*(3*n)!*(n/2)!).at n=3A364174
• Lexicographically earliest sequence of distinct positive integers such that the product of two consecutive terms is always a factorial number.at n=23A382067
• a(n) = 2^(n-4)*(5*binomial(n,5) + 6*binomial(n,4)).at n=11A384686