19728190

Appears in sequences

• Add 1, multiply by 1, add 2, multiply by 2, etc.; start with 0.at n=20A019461
• a(n) = n*(n + a(n-1)) with a(0)=0.at n=10A030297
• Triangle read by rows: T(i,j) = (T(i-1,j) + i)*i.at n=45A121682