A046612 Distinct numbers in writing first numerator and then denominator of the central elements of the 1/5-Pascal triangle (by row).

1, 5, 12, 46, 34, 126, 2352, 8844, 33462, 25454, 97240, 1864356, 7171892, 27665596, 21395520, 82907640, 321868854, 1251661518, 4874644104, 19010020260, 74225053980, 290134122564, 1135234789728, 4446052592904, 17427428373420

Offset

1,2

Links

Table of n, a(n) for n=1..25.

Example

1/1; 1/1 1/1; 1/1 1/5 1/1; 1/1 6/5 6/5 1/1; 1/1 11/5 12/5 11/5 1/1; 1/1 16/5 23/5 23/5 16/5 1/1; 1/1 21/5 39/5 46/5 39/5 21/5 1/1; 1/1 26/5 12/1 17/1 17/1 12/1 26/5 1/1; ...

Crossrefs

Cf. A046601.

Sequence in context: A052280 A195541 A006078 * A254217 A211951 A356539

Adjacent sequences: A046609 A046610 A046611 * A046613 A046614 A046615

Keyword

nonn

Author

Mohammad K. Azarian

Extensions

More terms from James A. Sellers, Dec 16 1999

Status

approved