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

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A029638 Numbers in the (1,2)-Pascal triangle A029635 that are different from 1. 3
2, 3, 2, 4, 5, 2, 5, 9, 7, 2, 6, 14, 16, 9, 2, 7, 20, 30, 25, 11, 2, 8, 27, 50, 55, 36, 13, 2, 9, 35, 77, 105, 91, 49, 15, 2, 10, 44, 112, 182, 196, 140, 64, 17, 2, 11, 54, 156, 294, 378, 336, 204, 81, 19, 2, 12, 65, 210, 450, 672, 714, 540, 285, 100, 21, 2, 13, 77, 275, 660, 1122 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

1,1

REFERENCES

D. M. Bressoud, Proofs and Confirmations, Camb. Univ. Press, 1999; triangle on page 6, denominators.

LINKS

Table of n, a(n) for n=1..71.

Eric Weisstein's World of Mathematics, Alternating Sign Matrix.

D. Zeilberger, Dave Robbins's Art of Guessing, Adv. in Appl. Math. 34 (2005), 939-954.

EXAMPLE

Triangle begins:

2,

3,2,

4,5,2,

5,9,7,2,

6,14,16,9,2,

7,20,30,25,11,2,

...

CROSSREFS

Cf. A048601, A029656.

Sequence in context: A226208 A214540 A214595 * A136181 A265110 A003976

Adjacent sequences:  A029635 A029636 A029637 * A029639 A029640 A029641

KEYWORD

nonn,tabl,frac

AUTHOR

Mohammad K. Azarian

EXTENSIONS

More terms from David W. Wilson

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 February 17 21:12 EST 2018. Contains 299297 sequences. (Running on oeis4.)