18075

Appears in sequences

• Number of rooted trees with n nodes with every leaf at height 4.at n=21A048809
• Numerator of Sum_{1<=k<=n, gcd(k,n)=1} 1/k.at n=14A093600
• a(n) = 2^n*(Gamma(n+1/2)/Gamma(1/2) + (n-1)!).at n=5A123332
• Composites that are the sum of two, three, four and five consecutive composite numbers.at n=21A151745
• Cyclops numbers whose squares are cyclops numbers.at n=32A239827
• Number of partitions p of n such that the number of parts having multiplicity 1 is a part or max(p) - min(p) is a part.at n=38A241451
• The number of P-positions in the game of Nim with up to 5 piles, allowing for piles of zero, such that the number of objects in the largest pile is n.at n=15A241731
• Numbers n such that n*2^2281 - 1 is prime.at n=14A265504
• Numbers k such that (26*10^k - 173)/3 is prime.at n=20A293910
• Number of n X n 0..1 arrays with every element equal to 2, 3, 4, 5 or 8 king-move adjacent elements, with upper left element zero.at n=4A298835
• Number of nX5 0..1 arrays with every element equal to 2, 3, 4, 5 or 8 king-move adjacent elements, with upper left element zero.at n=4A298838
• T(n,k)=Number of nXk 0..1 arrays with every element equal to 2, 3, 4, 5 or 8 king-move adjacent elements, with upper left element zero.at n=40A298841
• Expansion of e.g.f. sin( sqrt(2) * (exp(x) - 1) )/sqrt(2).at n=9A357736
• a(n) = Sum_{k=0..floor(n/2)} binomial(k+3,3) * binomial(n,k) * binomial(n-k,k).at n=8A392033