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!)
 A198759 The number of pairs of braces to note the properly nested set with n elements. 1
 1, 2, 4, 7, 11, 15, 20, 25, 30, 36, 42, 48, 54, 60, 66, 73, 80, 87, 94, 101, 108, 115, 122, 129, 136, 143, 150, 158, 166, 174, 182, 190, 198, 206, 214, 222, 230, 238, 246, 254, 262, 270, 278, 286, 294, 302, 310, 318, 326, 334, 342 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 LINKS F. T. Adams-Watters, Re: Set of sets using minimal number of braces, SeqFan Oct 29 2011 J. Zucker, Set of sets using minimal number of braces, SeqFan Oct 25 2011 MAPLE # implementing the Adams-Watters partial sum formula up to nmax elements read("transforms") ; nmax := 40 ; a004111rep := [1, 1] ; n := 2 ; while nops(a004111rep) < nmax do         a004111rep := [op(a004111rep), seq(n, i=1..A004111(n))] ;         n := n+1 ; end do: PSUM(a004111rep) ; CROSSREFS Cf. A004111. Sequence in context: A250621 A003068 A194168 * A078617 A199085 A247184 Adjacent sequences:  A198756 A198757 A198758 * A198760 A198761 A198762 KEYWORD nonn AUTHOR R. J. Mathar, Oct 29 2011 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 May 30 18:38 EDT 2020. Contains 334728 sequences. (Running on oeis4.)