n81 n71 n18 n1 n1 n3 n41
Объяснение:
a(n+1) = 2((n+1) - 10) = 2(n - 9)
a(n-1) = 2((n-1) - 10) = 2(n-11)
a(n+5) = 2((n+5) -10) = 2(n-5)
