43032

Appears in sequences

• a(n) = a(1)*a(n-1) + a(2)*a(n-2) + ...+ a(n-1)*a(1) for n >= 5, with initial values 0,0,1,1.at n=27A025277
• Expansion of Product_{k>=1} (1 + 3*x^k).at n=29A032308
• Ninth column (k=8) of sextinomial array A063260.at n=9A063263
• Number of interior balls in a truncated tetrahedral arrangement.at n=22A092966
• O.g.f.:G(G(x)-1)where G(x)=Sum_k>=0,k!*x^k.at n=7A158900
• n-th derivative of cos(x)^tanh(x) at x=0.at n=11A215585
• Expansion of ( f(-q)^12 + 22 * q * f(-q)^6 * f(-q^5)^6 + 125 * q^2 * f(-q^5)^12 ) / (f(-q) * f(-q^5))^2 in powers of q where f() is a Ramanujan theta function.at n=16A235870
• Number of ordered trees with n edges such that non-leaf vertices at even levels have outdegree 1 and those at odd levels have outdegree 2.at n=25A248100
• Numbers n whose sum of divisors equals the sum of divisors of 2n+1.at n=16A272553