209715200

Appears in sequences

• Expansion of (1 + 2*x)/(1 - 2*x)^3.at n=19A014477
• a(0)=0, a(1)=1, a(n) = n*2^(n-2) for n >= 2.at n=25A057711
• Smallest number beginning with 2 and having exactly n prime divisors counted with multiplicity.at n=24A106422
• Binomial transform of A124625.at n=25A129952
• a(n) is the smallest positive integer m with exactly n zeros in its binary representation and with n represented in binary as a substring of the binary representation of m.at n=24A147761
• Number of binary strings of length n with equal numbers of 0001 and 1000 substrings.at n=28A164161
• Triangle of coefficients of polynomials P_n(z) defined by the recursion P_0(z) = z+1; for n>=1, P_n(z) = z + Product_{k=0..n-1} P_k(z).at n=41A177701
• Number of defective 3-colorings of an n X 2 0..2 array connected horizontally and antidiagonally with exactly one mistake, and colors introduced in row-major 0..2 order.at n=12A229580
• Expansion of e.g.f. (1+x)*cosh(x)^2.at n=25A383608
• Expansion of e.g.f. cosh(x)^2*(x+x^2/2).at n=25A385601
• Expansion of e.g.f. cosh(x)^2*(1 + x + x^2/2).at n=25A386227
• a(n) = n*2^(n-1) + binomial(n,2)*2^(n-2) + binomial(n,3)*2^(n-3).at n=20A387185