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!)
A123002 Triangle read by rows: T(n, m) := 2^(n - 1)*(2*m - 1) - 2^(m - 1)*(2*n - 1). 0
0, -1, 0, -1, 2, 0, 1, 10, 12, 0, 7, 30, 44, 40, 0, 21, 74, 116, 136, 112, 0, 51, 166, 268, 344, 368, 288, 0, 113, 354, 580, 776, 912, 928, 704, 0, 239, 734, 1212, 1656, 2032, 2272, 2240, 1664, 0, 493, 1498, 2484, 3432, 4304, 5024, 5440, 5248, 3840, 0 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

1,5

COMMENTS

From a problem on Peano mappings.

REFERENCES

S. M. Ulam, Problems in Modern Mathematics, John Wiley and Sons, New York, 1960, page 32.

LINKS

Table of n, a(n) for n=1..55.

G. S. Stoller, Three problems of S. M. Ulam with solutions and generalizations, Colloquium Mathematicum 36 (1976), 43-48.

EXAMPLE

0

-1, 0

-1, 2, 0

1, 10, 12, 0

7, 30, 44, 40, 0

21, 74, 116, 136, 112, 0

MATHEMATICA

T[n_, m_] := 2^(n - 1)*(2*m - 1) - 2^(m - 1)*(2*n - 1); a = Table[Table[T[n, m], {m, 1, n}], {n, 1, 10}]; Flatten[a]

CROSSREFS

Sequence in context: A185410 A264676 A091803 * A261161 A137514 A322221

Adjacent sequences:  A122999 A123000 A123001 * A123003 A123004 A123005

KEYWORD

sign,tabl

AUTHOR

Roger L. Bagula, Sep 23 2006

EXTENSIONS

Edited by N. J. A. Sloane, Oct 01 2006

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 April 17 11:26 EDT 2021. Contains 343064 sequences. (Running on oeis4.)