Question

Find the first six terms of the sequence. a1 = 1, an = 4 • an-1

Answer 1

$\bf \begin{array}{ccllll} n&term&value\\ ---&-----&-----\\ 1&a_1&1\\ 2&a_2&4\cdot a_{2-1}\\ &&4\cdot a_1\\ &&4\\ 3&a_3&4\cdot a_{3-1}\\ &&4\cdot a_2\\ &&16\\ 4&a_4&4\cdot a_{4-1}\\ &&4\cdot a_3\\ &&64\\ 5&a_5&4\cdot a_{5-1}\\ &&4\cdot a_4\\ &&256\\ 6&a_6&4\cdot a_{6-1}\\ &&4\cdot a_5\\ &&1024 \end{array}$