The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 Hints (Greetings from The On-Line Encyclopedia of Integer Sequences!)
 A007470 Shifts left when Stirling2 transform is applied twice. (Formerly M2979) 1
 1, 1, 3, 14, 97, 934, 11814, 188650, 3698399, 87133235, 2424143590, 78483913829, 2920947798710, 123676552368689, 5904927996501989, 315465738505181316, 18730636267115299571, 1228583480023634860711, 88548597460914590753663, 6979070787198903764535472 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 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 = 1..120 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] N. J. A. Sloane, Transforms MAPLE stirtr:= proc(p)            proc(n) add(p(k)*Stirling2(n, k), k=0..n) end          end: a:= proc(n) option remember; `if`(n<2, 1, aa(n-1)) end: aa:= (stirtr@@2)(a): seq(a(n), n=1..25);  # Alois P. Heinz, Jun 22 2012 MATHEMATICA stirtr[p_] := Function[{n}, Sum[p[k]*StirlingS2[n, k], {k, 0, n}]]; a[n_] := a[n] = If[n < 2, 1, aa[n-1]]; aa := stirtr[stirtr[a]]; Table[a[n], {n, 1, 25}] (* Jean-François Alcover, Oct 30 2013, translated from Alois P. Heinz's Maple program *) CROSSREFS Sequence in context: A136461 A336525 A276747 * A306986 A074515 A336947 Adjacent sequences:  A007467 A007468 A007469 * A007471 A007472 A007473 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
The OEIS Community | Maintained by The OEIS Foundation Inc.

Last modified October 29 19:29 EDT 2020. Contains 338069 sequences. (Running on oeis4.)