28839

Appears in sequences

• E.g.f.: 1 - (1-x)*(tan(x) + sec(x)).at n=10A034428
• Number of compositions (ordered partitions) of n whereby at most 1 increase is allowed and this increase must be by 1.at n=26A090752
• Triangle read by rows: T(n,k) is the number of permutations p of [n] in which exactly the first k terms satisfy the up-down property, i.e., p(1)<p(2), p(2)>p(3), p(3)<p(4), ...at n=53A092580
• Beta polynomials (coefficients in descending order, triangle read by rows).at n=53A177762
• Beta polynomials (coefficients in descending order, triangle read by rows).at n=54A177762
• Expansion of Product_{k>=0} (1 + x^(3^k) + x^(2*3^k) + x^(3^(k+1)))^(3^k).at n=48A309046