login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A272657 Bisection of A003319: A003319(2n+1). 3
1, 3, 71, 3447, 273343, 31998903, 5201061455, 1123596277863, 311951144828863, 108355864447215063, 46066653228356851631, 23539631662517304379719, 14238556471214701698866335, 10063612905845566536549621687, 8219089293266835899526592972943, 7682002790499533568011331441585447 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

LINKS

Vincenzo Librandi, Table of n, a(n) for n = 0..200

MATHEMATICA

(* b = A003319 *) b[0] = 0; b[n_] := b[n] = n! - Sum[k!*b[n-k], {k, 1, n-1} ]; a[n_] := b[2n + 1]; Table[a[n], {n, 0, 15}] (* Jean-Fran├žois Alcover, Feb 18 2018 *)

CROSSREFS

Cf. A003319, A272656.

Sequence in context: A094458 A183548 A111649 * A226709 A226844 A300540

Adjacent sequences:  A272654 A272655 A272656 * A272658 A272659 A272660

KEYWORD

nonn

AUTHOR

N. J. A. Sloane, May 15 2016

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.

License Agreements, Terms of Use, Privacy Policy. .

Last modified February 20 21:29 EST 2019. Contains 320350 sequences. (Running on oeis4.)