A140598 a(1)=1. a(2n+1) = sum{k=1 to 2n} a(k). a(2n) = the smallest positive integer not yet occurring in the sequence.

1, 2, 3, 4, 10, 5, 25, 6, 56, 7, 119, 8, 246, 9, 501, 11, 1013, 12, 2038, 13, 4089, 14, 8192, 15, 16399, 16, 32814, 17, 65645, 18, 131308, 19, 262635, 20, 525290, 21, 1050601, 22, 2101224, 23, 4202471, 24, 8404966, 26, 16809958, 27, 33619943, 28, 67239914, 29

Offset

0,2

Comments

This is a permutation of the positive integers.

Links

Table of n, a(n) for n=0..49.

Crossrefs

Sequence in context: A158929 A255479 A256618 * A129920 A356332 A065634

Adjacent sequences: A140595 A140596 A140597 * A140599 A140600 A140601

Keyword

easy,nonn

Author

Leroy Quet, Jul 07 2008

Extensions

Extended by R. J. Mathar, Aug 04 2008

Status

approved