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A007548 Shifts 3 places left under exponentiation.
(Formerly M1485)
+0
1
1, 1, 1, 1, 2, 5, 15, 53, 213, 961, 4808, 26405, 157965, 1022573, 7122441, 53118601, 422362118, 3566967917, 31887812715, 300848966213, 2987359924149, 31143724848889, 340113005563268, 3882897830626949, 46254432194746377 (list; graph; listen)
OFFSET

1,5

REFERENCES

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

LINKS

M. Bernstein and N. J. A. Sloane, Some canonical sequences of integers, Linear Alg. Applications, 226-228 (1995), 57-72; erratum 320 (2000), 210.

MAPLE

exptr:= proc (p) local g; g:= proc(n) option remember; p(n) +add (binomial (n-1, k-1) *p(k) *g(n-k), k=1..n-1) end: end: b:= exptr (a): a:= n-> `if` (n<=2, 1, b(n-3)): seq (a(n), n=1..30); [From Alois P. Heinz (heinz(AT)hs-heilbronn.de), Oct 07 2008]

CROSSREFS

Sequence in context: A134381 A107589 A006790 this_sequence A120567 A125280 A022493

Adjacent sequences: A007545 A007546 A007547 this_sequence A007549 A007550 A007551

KEYWORD

nonn,eigen

AUTHOR

N. J. A. Sloane (njas(AT)research.att.com).

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Last modified December 7 08:40 EST 2009. Contains 170430 sequences.


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