66138

Appears in sequences

• a(n) = floor(n(n-1)(n-2)(n-3)/19).at n=35A011929
• Number of up steps starting at an even level in all nondecreasing Dyck paths of semilength n. A nondecreasing Dyck path is a Dyck path for which the sequence of the altitudes of the valleys is nondecreasing.at n=10A121523
• Start with a(1)=1; for n >= 1, a(n+1)=a(n)+a(k) with k=[n-n-th digit of "e"]. If k<0 or k=0, then a(k)=0.at n=41A133392
• Number of triangles that can be built from rods with lengths 1,2,...,n by using and concatenating not necessarily all rods.at n=17A160456