70155
domain: N
Appears in sequences
- Numbers k such that 5^k - 4 is prime.at n=13A059613
- Number T(n,k) of ascent sequences of length n with exactly k flat steps; triangle T(n,k), n>=0, 0<=k<=n, read by rows.at n=56A242153
- Number of ascent sequences of length n with exactly one flat step.at n=8A242154
- a(1) = a(2) = a(3) = 1; for n > 3, a(n) = ceiling((a(n-1) + a(n-2) + a(n-3))/2).at n=52A258875