86977

Appears in sequences

• a(n) = a(n-1) + Sum_{k=0..n-3} a(k) for n >= 2, a(0)=1, a(1)=2.at n=21A049853
• a(1) = 1, a(2) = 2, a(3) = 3, a(n+3) = a(n) + a(n+1).at n=39A084338
• Number of positive words of length n in the monoid Br_3 of positive braids on 4 strands.at n=13A097550
• Number of times prime(n) occurs as the least prime factor among numbers 1 .. prime(n)^4: a(n) = A078898(A030514(n)).at n=23A250478