Question 1124668
{{{ a[n] = a[n-1] + 2 }}}  ; {{{a[0] = 4 }}}

{{{ a[1] = a[0] + 2 = 4+2 = 6 }}}
{{{ a[2] = a[1] + 2 = 6+2 = 8 }}}
{{{ a[3] = a[2] + 2 = 8+2 = 10 }}}

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The closed form (which allows you to find the n-th term directly) is  {{{ a[n] = 2n+4 }}} ;  n=0,1,2,3,…