A046574 Distinct numbers in writing first numerator and then denominator of the central elements of the 1/4-Pascal triangle (by row).

1, 4, 5, 2, 19, 35, 259, 483, 1815, 6864, 52195, 99671, 382109, 1469650, 5668327, 21915550, 84913470, 329624730, 2563431075, 4991324415, 19463777025, 75992317170, 297026449005, 1162147683450, 4551257541090, 17839099909800

Offset

1,2

Links

Table of n, a(n) for n=1..26.

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: A307385 A354700 A046572 * A019743 A010663 A016494

Adjacent sequences: A046571 A046572 A046573 * A046575 A046576 A046577

Keyword

nonn

Author

Mohammad K. Azarian

Extensions

More terms from James A. Sellers, Dec 14 1999

Status

approved