28785

Appears in sequences

• Number of rooted trees with n nodes with every leaf at height 4.at n=22A048809
• Number of rooted identity trees with n nodes and 3 leaves.at n=31A055328
• Recurrence derived from the decimal places of sqrt(2). a(0)=0, a(i+1)=position of first occurrence of a(i) in decimal places of sqrt(2).at n=16A098326
• a(n) = number of set partitions of {1, 2, ..., n} whose blocks consist only of elements that differ by two or less (that is, have only the forms {i}, {i,i+1}, {i,i+2}, or {i,i+1,i+2}).at n=15A129847
• Numbers k such that k and k^2 use only the digits 2, 5, 6, 7 and 8.at n=30A137111
• Binomial transform of [1, 4, 10, 20, 0, 0, 0, ...].at n=21A143131
• a(n) = numerator of constant lambda(n) involved in a recurrence for the Atkin polynomials A_k(j).at n=16A145226
• Numbers k such that k^3 divides 14^(k^2) + 1.at n=22A177814
• Number of (w,x,y,z) with all terms in {1,...,n} and w <= x > y <= z.at n=19A212246
• Squarefree nonprimes n with a divisor d such that phi(n) divides n+d.at n=27A217741
• Number of length n+5 0..5 arrays with no six consecutive terms having the maximum of any two terms equal to the minimum of the remaining four terms.at n=0A249957
• T(n,k)=Number of length n+5 0..k arrays with no six consecutive terms having the maximum of any two terms equal to the minimum of the remaining four terms.at n=10A249960
• Number of length 1+5 0..n arrays with no six consecutive terms having the maximum of any two terms equal to the minimum of the remaining four terms.at n=4A249961
• Expansion of x*(1 + 3*x + x^2)/((1 - x)^5*(1 + x)^4).at n=36A287143
• Triangular array T(n,k), read by rows: coefficients of strong divisibility sequence of polynomials p(1,x) = 1, p(2,x) = 1 + 5x, p(n,x) = u*p(n-1,x) + v*p(n-2,x) for n >=3, where u = p(2,x), v = 1 - x - x^2.at n=32A367210