4063232

Appears in sequences

• Expansion of e.g.f. (1 + tan(x))/(1 - tan(x)).at n=9A000831
• E.g.f. arctanh(tan(x)*tan(x)) (even powers only).at n=5A012393
• Numbers k of the form k=p*2^x, with p prime and x>=0, such that tau(k)-m = A058933(k) where tau(k) is the number of divisors of k and m is 0 or 1.at n=10A058953
• Smallest number beginning with 4 and having exactly n prime divisors counted with multiplicity.at n=17A106424
• Number of solutions to Sum_{i=1..n} x_i^2 == 0 (mod 4) with x_i in 0..3.at n=11A228920
• 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=22A257548
• Array read by rows: T(n,k) is the number of solutions to the equation Sum_{i=1..n} x_i^2 == k (mod 4) with x_i in 0..3, where n >= 0 and 0 <= k <= 3.at n=48A330619