52252

Appears in sequences

• a(0)=0; a(1)=1; a(n) = Sum_{k=1..[sqrt(n)]} a(n-k) for n>=2.at n=21A132915
• Triangle read by rows: distribution of adjacent transpositions in involutions.at n=43A217876
• Numbers k such that prime(k), prime(k+1), prime(k+2), prime(k+3) and prime(k+4) all have the same last digit.at n=7A371390