72601

Appears in sequences

• G.f.: A(x) = Sum_{n>=0} x^n / Product_{k=1..n} (1-x^k)^k.at n=24A206100
• Partial sums of A008531, or crystal ball sequence for {A_4}* lattice.at n=15A222408
• Numbers k with the property that it is possible to write the base 2 expansion of k as concat(a_2,b_2), with a_2>0 and b_2>0 such that, converting a_2 and b_2 to base 10 as a and b, we have sigma(a) + sigma (b) = sigma(k) - k.at n=38A258813
• a(n) = 1 - 5*(n + 1)^2 + 5*(n + 1)^4.at n=10A385897