190737

Appears in sequences

• The number of all possible covers of L-length line segment by 3-length line segments with allowed gaps < 3.at n=45A228362
• Number of equivalence classes of ballot paths of length n for the string uu.at n=22A274110
• a(0) = 1, a(1) = 0, a(2) = a(3) = 1; thereafter, a(n) = a(n-1) + a(n-2) + a(n-4).at n=24A347493