328185

Appears in sequences

• a(n) = (2*n+7)!!/7!!, related to A001147 (odd double factorials).at n=5A051581
• Group odd numbers into (1), (3,5,7), (9,11,13,15,17), ...; a(n) = product of n-th group.at n=2A062031
• Product of n-th group of terms in A074147.at n=4A082735
• An invertible triangle of ratios of double factorials.at n=49A112292
• Sequence related to the column sums of the BG2 matrix.at n=9A161738
• Number of n X 4 0..1 arrays avoiding 0 0 1 and 1 0 0 horizontally and 0 0 1 and 1 0 1 vertically.at n=32A209646
• a(n) is the number of Dyck paths of length 4n and height n.at n=7A268316
• Number of Dyck paths of semilength n and height exactly 7.at n=7A289420
• Number A(n,k) of Dyck paths of semilength k*n and height n; square array A(n,k), n>=0, k>=0, read by antidiagonals.at n=52A289481
• a(n) is the smallest number that has exactly n binary palindrome divisors (A006995).at n=30A355716
• a(n) = (1/30)*A028361(n) for n>=3.at n=4A374854
• E.g.f. A(x) satisfies A(x) = exp( arcsinh(x * A(x)^2) ).at n=6A385440