Let $a_n$ denote the number of all $n$-digit positive integers formed by the digits 0,1 or both such that no consecutive digits in them are 0 . Let $\mathrm{b}_{\mathrm{n}}=$ the number of such n -digit integers ending with digit 1 and $\mathrm{c}_{\mathrm{n}}=$ the number of such $n$-digit integers ending with digit 0 .
The value of $b_6$ is