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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A108934 Triangle obtained by considering certain successive approximations to the Bell numbers. 0
1, 0, 1, 0, 1, 1, 0, 1, 1, 1, 0, 1, 2, 1, 1, 0, 1, 4, 2, 1, 1, 0, 1, 8, 5, 2, 1, 1, 0, 1, 16, 14, 5, 2, 1, 1, 0, 1, 32, 41, 15, 5, 2, 1, 1, 0, 1, 64, 122, 51, 15, 5, 2, 1, 1, 0, 1, 128, 365, 187, 52, 15, 5, 2, 1, 1, 0, 1, 256, 1094, 715, 202, 52, 15, 5, 2, 1, 1 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

0,13

LINKS

Table of n, a(n) for n=0..77.

FORMULA

Each row has e.g.f. given by a truncated exponential series in exp(x)-1. For example the e.g.f. = 1 + (exp(x)-1) + (1/2)(exp(x)-1)^2 gives the sequence 1, 1, 2, 4, 8, 16... . Alternatively, first differences of columns gives triangle of Stirling numbers of 2nd kind A008277.

EXAMPLE

Triangle starts:

1;

0, 1;

0, 1, 1;

0, 1, 1, 1;

0, 1, 2, 1, 1;

0, 1, 4, 2, 1, 1;

0, 1, 8, 5, 2, 1, 1;

0, 1, 16, 14, 5, 2, 1;

...

CROSSREFS

Cf. A000110.

Sequence in context: A060959 A077042 A144903 * A108947 A338859 A152459

Adjacent sequences:  A108931 A108932 A108933 * A108935 A108936 A108937

KEYWORD

easy,nonn,tabl

AUTHOR

Paul Boddington, Jul 20 2005

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 March 8 07:17 EST 2021. Contains 341941 sequences. (Running on oeis4.)