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A129939
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"Self-Lucas"; a(n) is the sum of the last 5 terms. Sequence starts with 12,21,3,1,19 which are l,u,c,a,s if you consider a=1, b=2, c=3, ..., z=26.
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12, 21, 3, 1, 19, 56, 100, 179, 355, 709, 1399, 2742, 5384, 10589, 20823, 40937, 80475, 158208, 311032, 611475, 1202127, 2363317, 4646159, 9134110, 17957188, 35302901, 69403675, 136444033, 268241907, 527349704, 1036742220, 2038181539
(list; graph; refs; listen; history; internal format)
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OFFSET
| 1,1
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COMMENTS
| Search "Self-Fibonacci" in the database for an equivalent sequence.
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FORMULA
| G.f.:(-12+18*x^4+35*x^3+30*x^2-9*x)/(-1+x^5+x^4+x^3+x^2+x) [From Maksym Voznyy (voznyy(AT)mail.ru), Aug 12 2009]
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MAPLE
| A129939 := proc(n) option remember ; if n <= 5 then op(n, [12, 21, 3, 1, 19]) ; else add(A129939(n-i), i=1..5) fi ; end: seq(A129939(n), n=1..50) ; - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Sep 02 2007
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CROSSREFS
| Sequence in context: A167351 A078600 A076638 * A082799 A089320 A116700
Adjacent sequences: A129936 A129937 A129938 * A129940 A129941 A129942
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KEYWORD
| base,easy,nonn,word
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AUTHOR
| Eric Angelini (eric.angelini(AT)kntv.be), Jun 09 2007
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EXTENSIONS
| More terms from R. J. Mathar (mathar(AT)strw.leidenuniv.nl), Sep 02 2007
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