2080374784

Appears in sequences

• Generalized tangent numbers d(4,n).at n=4A000318
• Denominators of Taylor series expansion of arcsin(x). Also arises from arccos(x), arccsc(x), arcsec(x), arcsinh(x).at n=15A002595
• Number of 1's in all compositions of n+1.at n=28A045623
• Numerators of the BG1[ -5,n] coefficients of the BG1 matrix.at n=15A162443
• a(n) = n*2^(n-5).at n=26A196410
• Shanks's array d_{a,n} (a >= 1, n >= 1) that generalizes the tangent numbers, read by antidiagonals upwards.at n=32A235606
• a(1) = 1, a(2) = 2, a(3) = 5, a(4) = 8 and a(5) = 15, a(n) = Sum_{j=1..n-1} a(j).at n=31A257548
• Triangle read by rows: T(n,k) is the number of Boolean functions on n variables having an algebraic degree equal to k (for n >= 0 and 0 <= k <= n).at n=19A319511
• Number of subsets of {1..n} containing n whose mean is not an element.at n=32A327477
• Generalized Euler numbers, a(n) = n!*[x^n](sec(4*x)*(sin(4*x) + 1)).at n=9A349264
• a(n) = floor(n*2^n/(n + 1)).at n=31A350294