1048555
domain: N
Appears in sequences
- Eulerian numbers (Euler's triangle: column k=2 of A008292, column k=1 of A173018).at n=20A000295
- Distinct elements occurring in triangle of Eulerian numbers (sorted).at n=31A030196
- Numerator of Sum_{i=1..n} i/2^i.at n=19A036295
- Expansion of (-1+3*x-5*x^2+4*x^3) / ((1-2*x)*(2*x^2-1)*(x-1)^2).at n=19A114960
- a(n) = 2^(n+1) - n - 2, or partial sums of main diagonal of array A125127 of k-step Lucas numbers.at n=18A125128
- Expansion of e.g.f. e^(2x)-(1+x)*e^x+x.at n=20A130103
- a(n) = 4^n - 2*n - 1.at n=9A289255
- Number of even permutations on {1,2,...,n} with exactly 2 weak excedances.at n=21A293046