A046573 First denominator and then numerator of the central elements of the 1/4-Pascal triangle (by row).

1, 1, 4, 1, 2, 5, 2, 19, 1, 35, 2, 259, 1, 483, 1, 1815, 1, 6864, 2, 52195, 1, 99671, 1, 382109, 1, 1469650, 1, 5668327, 1, 21915550, 1, 84913470, 1, 329624730, 2, 2563431075, 1, 4991324415, 1, 19463777025, 1, 75992317170, 1, 297026449005, 1

Offset

1,3

Links

Table of n, a(n) for n=1..45.

Example

1/1; 1/1 1/1; 1/1 1/4 1/1; 1/1 5/4 5/4 1/1; 1/1 9/4 5/2 9/4 1/1; 1/1 13/4 19/4 19/4 13/4 1/1; 1/1 17/4 8/1 19/2 8/1 17/4 1/1; 1/1 21/4 49/4 35/2 35/2 49/4 21/4 1/1; ...

Crossrefs

Cf. A046563.

Sequence in context: A354104 A188931 A125560 * A006287 A087225 A366619

Adjacent sequences: A046570 A046571 A046572 * A046574 A046575 A046576

Keyword

nonn

Author

Mohammad K. Azarian

Extensions

More terms from James A. Sellers, Dec 14 1999

Status

approved