311296

Appears in sequences

• Number of 1's in all compositions of n+1.at n=16A045623
• a(n) = 2^(n-1)*(3*n-4).at n=14A053565
• Denominators of coefficients of 1/2^(2n+1) in Newton's series for Pi.at n=9A054388
• 15-almost primes (generalization of semiprimes).at n=20A069276
• Numerator of b(n) given by b(1) = 1, b(2) = 2; for n >= 3, b(n) = (-1)^n (2n-1) ((n-2)!!)^2/((n-1)!!)^2, where n!! is the double factorial A006882.at n=9A095159
• Numerators in the fractional coefficients that form the partial quotients of the continued fraction representation of the inverse tangent of 1/x.at n=9A110255
• Numerators in the coefficients that form the even-indexed partial quotients of the continued fraction representation of the inverse tangent of 1/x.at n=4A110259
• a(n) = 19*2^n.at n=14A110288
• Row sums of triangle A128182.at n=14A128183
• Expansion of (1+8x^2+8x^3)/((1-2x)^2*(1+2x+4x^2)).at n=14A168057
• Triangle T(n, k, q) = round(c(n,q)/(c(k,q)*c(n-k,q))), where c(n,q) = Product_{j=0..n} v(j, q)((1)), v(n, q) = M*v(n-1, q), v(0, q) = {1, 1, 1}, M = {{0, 1, 0}, {0, 0, 1}, {q^3, q^3, 0}}, and q = 2, read by rows.at n=30A173778
• Triangle T(n, k, q) = round(c(n,q)/(c(k,q)*c(n-k,q))), where c(n,q) = Product_{j=0..n} v(j, q)((1)), v(n, q) = M*v(n-1, q), v(0, q) = {1, 1, 1}, M = {{0, 1, 0}, {0, 0, 1}, {q^3, q^3, 0}}, and q = 2, read by rows.at n=33A173778
• a(n) = n*2^(n-5).at n=14A196410
• Triangular array read by rows: 3 dimensional analog of A227997.at n=13A229955
• Number of length n+4 0..3 arrays with no disjoint pairs in any consecutive five terms having the same sum.at n=28A247399
• a(n) = A257851(n,n).at n=13A264959
• Total number of vertices formed by intersections among sides and straight "chords" in a right triangle when each side is divided by vertices into n equal segments.at n=21A274585
• Numbers k such that sigma(sigma(k^4)) == 0 (mod k^2).at n=41A320425
• a(n) is the first number == 1 (mod n) that is the product of n primes, counted by multiplicity.at n=14A368217
• a(n) = Sum_{1 <= x_1, x_2, x_3, x_4 <= n} gcd(x_1, x_2, x_3, x_4, n)^4.at n=15A372931