Complete the recursive formula of the arithmetic sequence 20, 26, 32, 38,...20,26,32,38,...20, comma, 26, comma, 32, comma, 38, comma, point, point, point. a(1)=a(1)=a, left parenthesis, 1, right parenthesis, equals a(n)=a(n-1)+a(n)=a(n−1)+a, left parenthesis, n, right parenthesis, equals, a, left parenthesis, n, minus, 1, right parenthesis, plus