642676

Appears in sequences

• a(n+5) = a(n+4)+a(n+3)+a(n+2)+a(n+1)+2*a(n) with a(0)=2, a(1)=1, a(2)=5, a(3)=10, a(4)=20.at n=19A226311
• a(n) = n^5/5 + n^3/3 + 7*n/15.at n=20A385894