A046220 - OEIS

A046220

Distinct numbers in writing first numerator and then denominator of 1/2-Pascal triangle (by row).

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: A224075 A354790 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