259376

Appears in sequences

• a(n) = Sum_{k=1..n} -A068341(k+1)*a(n-k), a(0)=1.at n=19A073777
• Least pentagonal number P(m) > P(n) such that P(m)+P(n) is again a pentagonal number, 0 if no such m exists.at n=40A136114