32556

Appears in sequences

• a(n) = [ a(n-1)/a(1) + a(n-2)/a(2) + ... + a(1)/a(n-1) ], for n >= 3.at n=19A022857
• Number of 5-ary rooted trees with n nodes and height at most 6.at n=15A036617
• J(1)*theta3(z) where J(1) is the series given by A056948.at n=7A056949
• Sum of squares of entries of Wilkinson's eigenvalue test matrix of order 2n+1.at n=36A059834
• Sums of 4 distinct primorials.at n=33A177709
• Number of -n..n arrays x(0..3) of 4 elements with zero sum and nonzero second and third differences.at n=17A200205
• Number of nX3 0..2 arrays with every row and column running average nondecreasing rightwards and downwards.at n=6A200529
• Number of nX7 0..2 arrays with every row and column running average nondecreasing rightwards and downwards.at n=2A200533
• T(n,k)=Number of nXk 0..2 arrays with every row and column running average nondecreasing rightwards and downwards.at n=38A200534
• T(n,k)=Number of nXk 0..2 arrays with every row and column running average nondecreasing rightwards and downwards.at n=42A200534
• Triangle read by rows: number of (1-2-3)-avoiding permutations on n letters with k peaks.at n=51A236406
• Expansion of -(2*x)/(1-sqrt(1-(2*(1-sqrt(1-4*x^2)))/x)).at n=11A243022
• Number of subsets of {1,...,n} that cross their complement.at n=15A324172