A006161 a(n)=a(a(n-1)-1)+a(n+1-a(n-1)). (Formerly M0440)

1, 1, 2, 3, 3, 4, 5, 6, 6, 6, 7, 8, 9, 10, 10, 11, 11, 12, 13, 14, 15, 16, 16, 16, 16, 17, 18, 18, 19, 20, 21, 22, 23, 24, 24, 25, 25, 26, 26, 26, 27, 28, 29, 29, 29, 30, 31, 32, 33, 34, 35, 36, 36, 37, 38, 38, 39, 40, 40, 41, 41, 42, 43, 44, 45, 45, 45, 45, 45, 46, 46, 47, 48, 49

Offset

1,3

References

J. Arkin, D. C. Arney, L. S. Dewald and W. E. Ebel, Jr., Families of recursive sequences, J. Rec. Math., 22 (No. 22, 1990), 85-94.

N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

Links

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

Crossrefs

Sequence in context: A074753 A013928 A172104 * A132351 A025556 A338006

Adjacent sequences: A006158 A006159 A006160 * A006162 A006163 A006164

Keyword

nonn,easy

Author

N. J. A. Sloane.

Extensions

More terms from Antonio G. Astudillo (afg_astudillo(AT)lycos.com), Mar 28 2003

Status

approved