185856

Appears in sequences

• Number of permutations of length n with exactly two valleys.at n=4A000487
• Triangle read by rows: T(n,k) (n >= 1, 0 <= k <= ceiling(n/2)-1) = number of permutations of [n] with k peaks.at n=22A008303
• Sequence defined by the recurrence formula a(n+1)=sum(a(p)*a(n-p)+k,p=0..n)+l for n>=1, with here a(0)=1, a(1)=10, k=0 and l=-1.at n=7A177167
• Triangle of coefficients arising in expansion of n-th derivative of tan(x) + sec(x).at n=50A198895
• Number of length 2+3 0..n arrays with no four consecutive terms having the maximum of any two terms equal to the minimum of the remaining two terms.at n=10A250388
• a(n) = A341886(n)/2; numbers k such that A307437(k) is even.at n=34A341887
• Numbers k such that A000005(k) = A000688(k).at n=29A369168