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

 

Logo

Annual Appeal: Please make a donation (tax deductible in USA) to keep the OEIS running. Over 5000 articles have referenced us, often saying "we discovered this result with the help of the OEIS".

Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A167142 Column 0 of the matrix square of triangle A167015. 4
1, 2, 5, 23, 171, 1770, 23128, 359326, 6397582, 127481106, 2798191975, 66906139414, 1728471631521, 47946527974230, 1421014299626478, 44813786218342428, 1498598183095006145, 52978138615818746064 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,2

COMMENTS

This sequence equals the reversal of row 2 of A167015 (when infinitely extended to the left), and then shifted left 1 place.

In triangle T=A167015, row n of T equals the initial n terms in column 0 of matrix power T^n, reversed and with an appended '1'.

The definition of A167015 may be relaxed to allow the triangle to extend indefinitely also to the left, making each row infinite.

LINKS

Table of n, a(n) for n=0..17.

CROSSREFS

Cf. A167015, rows: A167016, A167143, A167144, A167145.

Sequence in context: A032182 A165902 A191600 * A136731 A257030 A062495

Adjacent sequences:  A167139 A167140 A167141 * A167143 A167144 A167145

KEYWORD

nonn

AUTHOR

Paul D. Hanna, Oct 28 2009

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 | More pages
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy .

Last modified December 2 15:01 EST 2016. Contains 278678 sequences.