48713

Appears in sequences

• Number of loopless rooted planar maps with 4 faces and n vertices and no isthmuses.at n=10A006417
• Numbers k such that 30*k + {1,11,13,17,19,23,29} are all prime.at n=3A100418
• G.f.: Sum_{n>=0} x^n * (1+x)^sigma(n).at n=16A227236
• Irregular triangle read by rows: T(n,k) gives the number of ballot sequences of length n having k descents, n>=0, 0<=k<=A083920(n-1).at n=53A238122
• Number of ballot sequences of length n having exactly two descents.at n=8A241795
• Numbers k such that there are exactly 7 primes between 30*k and 30*k+30.at n=16A385124