773201629

Properties

Appears in sequences

• Number of ways of choosing at most n-1 items from a set of size 2*n+1.at n=15A008549
• a(n) = 2^(n-1) - binomial(n, floor(n/2)).at n=30A093387
• Numerators of partial sums of a convergent series with value 4, involving scaled Catalan numbers A000108.at n=14A119951
• Sum_{k=0..14} binomial(n,k).at n=31A220051
• a(n) = 2^(n-1) + ((1+(-1)^n)/4)*binomial(n, n/2) - binomial(n, floor(n/2)).at n=31A294175
• a(n) = 2^(2*n - HammingWeight(n)) * [x^n] ((x - 1)^(-2) - (1 - x)^(-3/2)).at n=15A380952
• Prime numbersat n=39837597