A066204 a(1) = 4; a(2) = 3; a(3) = 1; for n > 3, a(n) = a(n-1)-(n-1) if this is positive and has not already appeared in the sequence, otherwise a(n) = a(n-1)+(n-1).

4, 3, 1, 4, 8, 13, 7, 14, 6, 15, 5, 16, 28, 41, 27, 12, 28, 11, 29, 10, 30, 9, 31, 54, 78, 53, 79, 52, 24, 53, 23, 54, 22, 55, 21, 56, 20, 57, 19, 58, 18, 59, 17, 60, 104, 149, 103, 150, 102, 151, 101, 50, 102, 49, 103, 48, 104, 47, 105, 46, 106, 45, 107, 44, 108, 43, 109

Offset: 1

Author

N. J. A. Sloane, Dec 16 2001

Keywords

• nonn
• easy

Links

• Index entries for sequences related to Recamán's sequence

Crossrefs

A variant of A005132. A row of the array in A066202.

Extensions

More terms from Vladeta Jovovic, Dec 16 2001