2097110

Appears in sequences

• Second-order Eulerian numbers: a(n) = 2^n - 2*n.at n=21A005803
• Expansion of (1-x)^(-1)/(1 - x - 2*x^2 + 2*x^3).at n=37A077866
• a(n) = A078152(2^n).at n=39A078157
• Records in A101119, which forms the nonzero differences of A006519 and A003484.at n=17A101120
• Sequence S with property that for n in S, a(n) = a(1) + a(2) +...+ a(n-1) and for n not in S, a(n) = n+1.at n=37A121173
• E.g.f.: (e^x - x)^2.at n=21A130102
• Partial sums of A000918, starting from index 1.at n=19A145654
• a(n) = 4*A061547(n+1) - 3*A166753(n).at n=19A166754
• Rectangular array A read by upward antidiagonals in which the entry in row n and column k is defined by A(n,k) = (2^a(n)*(6*k - (3 - (-1)^a(n))*(1 - (-1)^n)/2) - 2^n + 4)/6, n,k >= 1, where {a(n)} is the Beatty sequence A117630 defined by a(n) = floor(n*log(3)/log(3/2)).at n=28A254312
• The difference between number of even and number of odd Grassmannian permutations of size n.at n=42A356185