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# User:Gottfried Helms

### From OeisWiki

Research assistant with a teaching contract at university Kassel,Germany

(diploma:Social Assistance; later research assistant in geriatric rehabilitation, software engineering for clinical computer network and dostributed process documentation;

now teaching courses in introduction into social research and statistics),

Numbertheory is a nonprofessional ambition for a quite long time...

**Wiki contributions**:

- 2011/02/14 Tetration OEIS-focused introduction into the term "Tetration"
- 2011/??

**Sequences contributions** (sequences or comments):

- 2011/02/14 A184011 coefficients for the half-iterate of exp(x)-1
- 2010/
- 2009/

**Articles** related to, focused on or even initiated by sequences and their study in context of **OEIS**

- A "Dream" of a sequence <pdf> That beautiful sequence occured when the exp(x)-function is expressed by an infinite product instead by the defining powerseries

See: A067911 A137852 A006973

- Continued Fractions (1) a nice continued fraction has relations into OEIS,

See: Numerators: A052852 denominators:A000262

- Bell-numbers <pdf> A treatize on E.T.Bell's numbers, its generalizations (which are much documented in OEIS) and some less known properties like divergent sums et.al.

See: A000110A000258

- Bernoulli-numbers (2) <pdf> I found another recursive definition for the Bernoulli-numbers (which was in fact discovered in the end of 19'th century).

The treatize has some flavour of something like "eigensequences"

See: A106268 A001700

- Pascalmatrix tetrated An approach to apply iterated exponentiation to matrices condensed to become this treatize.

The "tetrated" pascalmatrix shows some sequences of numbers which are also in the**OEIS**, related to*"forests with n nodes and height at most 1,2,3,..."*

See: A000248 A000949 A000950 A000951 A000272

and also A124824