The pattern is: previous number × position + position. 4×1+1=5 (but shows 6?), 6×2+2=14 (but shows 15?), 15×3+3=48 (but shows 49?). Actually the pattern is: (prev×n) + (n-1) where n is the term position starting from 1, but adjusted. The actual pattern fits as: 4×1+2=6, 6×2+3=15, 15×3+4=49, 49×4+5=201, 201×5+6=1011.