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A006161 a(n)=a(a(n-1)-1)+a(n+1-a(n-1)).
(Formerly M0440)
2
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 (list; graph; refs; listen; history; text; internal format)
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 A005229

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

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Last modified December 14 17:55 EST 2019. Contains 329979 sequences. (Running on oeis4.)