1995181

Appears in sequences

• a(n) = E(n+1) - 2*E(n), where E(i) is the Euler number A000111(i).at n=11A000708
• Triangle T(n,k) = P(n,k)/2, n >= 2, 1 <= k < n, of one-half of number of permutations of 1..n such that the differences have k runs with the same signs.at n=53A008970