A076905 a(1)=1, a(n)=n-a(n-1)+a(a(n-1))-a(a(a(n-1))).

1, 1, 2, 2, 3, 4, 4, 5, 5, 6, 7, 7, 8, 8, 9, 9, 10, 10, 11, 12, 12, 13, 13, 14, 14, 15, 16, 16, 17, 17, 18, 18, 19, 19, 20, 21, 21, 22, 22, 23, 23, 24, 25, 25, 26, 26, 27, 28, 28, 29, 29, 30, 30, 31, 32, 32, 33, 33, 34, 34, 35, 35, 36, 37, 37, 38, 38, 39, 39, 40, 41, 41, 42, 42

Offset

1,3

Links

Table of n, a(n) for n=1..74.

Formula

Conjecture: let c be the real root of 1-2*x+x^2-x^3, c=0.5698402909980532659113..., then a(n)=floor(cn) +0 /+ 1

Crossrefs

Sequence in context: A163464 A317137 A139327 * A244224 A259549 A098295

Adjacent sequences: A076902 A076903 A076904 * A076906 A076907 A076908

Keyword

nonn

Author

Benoit Cloitre, Nov 27 2002

Status

approved