A046572 First numerator and then denominator of the central elements of the 1/4-Pascal triangle (by row).

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

Offset

1,4

Links

Table of n, a(n) for n=1..44.

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: A345210 A307385 A354700 * A046574 A019743 A010663

Adjacent sequences: A046569 A046570 A046571 * A046573 A046574 A046575

Keyword

nonn

Author

Mohammad K. Azarian

Extensions

More terms from James A. Sellers, Dec 14 1999

Status

approved