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It appears that 26 and 40 are missing
f = 10n + (n - 1)^2 For n=10 f = 10(10) + (10 - 1)^2 f = 181
There are infinitely many possible answers. The following is a solution as a polynomial of the lowest order: Un = (2n5 - 35n4 +230n3 - 699n2 +996n - 456)/4 for n = 1, 2, 3, ...
That would depend on your definition of "best".One "obvious" sequence is to cycle through the three operations:multiply by 2add 2subtract 1starting with a first number of "1".Then:use step 1 on the first number to get the second number (1 x 2 = 2), thenuse step 2 on the second number to get the third number (2 + 2 = 4), thenuse step 3 on the third number to get the fourth number (4 - 1 = 3), thenuse step 1 on the fourth number to get the fifth number (3 x 2 = 6), thenuse step 2 on the fifth number to get the sixth number (6 + 2 = 8), etc