A022995 a(n) = 39 - n.

39, 38, 37, 36, 35, 34, 33, 32, 31, 30, 29, 28, 27, 26, 25, 24, 23, 22, 21, 20, 19, 18, 17, 16, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0, -1, -2, -3, -4, -5, -6, -7, -8, -9, -10, -11, -12, -13, -14, -15, -16, -17, -18, -19, -20, -21

Offset: 0

Author

N. J. A. Sloane

Keywords

• sign
• easy

Comments

If we extend this sequence to negative n, then we have a permutation of the integers. - Alonso del Arte, Aug 02 2017

Links

• Tanya Khovanova, Recursive Sequences.
• Index entries for linear recurrences with constant coefficients, signature (2,-1).

Crossrefs

Cf. A022958 - A022996.

Programs

Mathematica

39 - Range[0, 59] (* Alonso del Arte, Aug 02 2017 *)

Formula

a(n) = -n + 39.