This site is supported by donations to The OEIS Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A007463 Shifts left under lcm-convolution with itself. (Formerly M1457) 4
 1, 1, 2, 5, 14, 40, 128, 369, 1214, 3516, 12776, 40534, 137404, 463232, 1602348, 5216253, 17753898, 58597316, 212150928, 710453534, 2366853608, 8584498376, 30026959300, 100396304016, 333997297900, 1157269900344, 3852364562536, 13917848281928, 45618032373712 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 REFERENCES N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence). LINKS Alois P. Heinz, Table of n, a(n) for n = 0..550 M. Bernstein and N. J. A. Sloane, Some canonical sequences of integers, Linear Alg. Applications, 226-228 (1995), 57-72; erratum 320 (2000), 210. [Link to arXiv version] M. Bernstein and N. J. A. Sloane, Some canonical sequences of integers, Linear Alg. Applications, 226-228 (1995), 57-72; erratum 320 (2000), 210. [Link to Lin. Alg. Applic. version together with omitted figures] MAPLE a:= proc(n) option remember;       `if`(n=0, 1, add(ilcm(a(i), a(n-1-i)), i=0..n-1))     end: seq(a(n), n=0..30);  # Alois P. Heinz, Jun 22 2012 MATHEMATICA a[0]=1; a[1]=1; a[n_] := a[n] = Sum[LCM[a[k], a[n-k-1]], {k, 0, n-1}]; Table[a[n], {n, 0, 30}] (* Jean-François Alcover, Sep 07 2012, after Alois P. Heinz *) PROG (PARI) N=66; v=vector(N);  v[1]=1; for(n=2, N, v[n]=sum(k=1, n-1, lcm(v[k], v[n-k])) ); v  \\ Joerg Arndt, Jun 30 2013 CROSSREFS Sequence in context: A151417 A045632 A148321 * A159308 A163189 A243881 Adjacent sequences:  A007460 A007461 A007462 * A007464 A007465 A007466 KEYWORD nonn,nice,eigen AUTHOR STATUS approved

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified November 15 18:10 EST 2018. Contains 317240 sequences. (Running on oeis4.)