30955

Appears in sequences

• Numbers whose set of base-13 digits is {1,2}.at n=33A032933
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, -1, 0), (-1, 0, -1), (-1, 1, 1), (1, -1, 0), (1, 1, 0)}.at n=9A149163
• Expansion of (1 + 10*x + 20*x^2 + 10*x^3 + x^4)/(1-x)^5.at n=11A160747
• Total number of maximal nilpotent subgroups of the alternating group, counting conjugates as distinct.at n=9A218964
• Numbers n such that prime(n) + reversal(prime(n)) is a square.at n=28A227371
• Numbers k such that (598*10^k - 31)/9 is prime.at n=23A281991
• a(n) = S(5,n)/S(1,n), where S(r,n) = Sum_{k = 0..floor(n/2)} ( binomial(n,k) - binomial(n,k-1) )^r.at n=7A361888
• a(n) = S(5,2*n-1)/S(1,2*n-1), where S(r,n) = Sum_{k = 0..floor(n/2)} ( binomial(n,k) - binomial(n,k-1) )^r.at n=3A361889
• a(n) = a(n-1) + 5*a(n-2), for n >= 0, with a(0) = 1 and a(1) = 0.at n=11A365824