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A046220 Distinct numbers in writing first numerator and then denominator of 1/2-Pascal triangle (by row). 0
1, 2, 3, 5, 7, 11, 9, 27, 20, 13, 19, 67, 40, 15, 51, 105, 147, 17, 33, 78, 126, 83, 111, 204, 273, 21, 305, 315, 477, 546, 23, 123, 407, 935, 792, 1023, 25, 73, 265, 671, 2519, 1815, 2046, 171, 338, 936, 3861, 6149, 29, 99, 847, 1274, 5733, 5005, 13871, 7722 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Table of n, a(n) for n=1..56.

EXAMPLE

1/1; 1/1 1/1; 1/1 1/2 1/1; 1/1 3/2 3/2 1/1; 1/1 5/2 3/1 5/2 1/1; 1/1 7/2 11/2 11/2 7/2 1/1; 1/1 9/2 9/1 11/1 9/1 9/2 1/1; 1/1 11/2 27/2 20/1 20/1 27/2 11/2 1/1; ...

CROSSREFS

Cf. A046213.

Sequence in context: A071963 A224075 A053724 * A141792 A180458 A060264

Adjacent sequences:  A046217 A046218 A046219 * A046221 A046222 A046223

KEYWORD

tabf,nonn,easy

AUTHOR

Mohammad K. Azarian

EXTENSIONS

More terms from James A. Sellers, Dec 13 1999

STATUS

approved

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Last modified September 20 17:42 EDT 2021. Contains 347588 sequences. (Running on oeis4.)