A272607 Possible single line scores, not counting multiples, in duplicate bridge.

50, 70, 80, 90, 100, 110, 120, 130, 140, 150, 160, 170, 180, 190, 200, 210, 230, 240, 250, 260, 270, 280, 300, 340, 350, 360, 380, 400, 420, 430, 440, 450, 460, 470, 480, 490, 500, 510, 520, 530, 540, 550, 560, 570, 580, 590, 600, 610, 620, 630, 640, 650, 660

Offset

1,1

Comments

Not the same as rubber bridge. The difference is in what is scored above and below "the line".

There are only 204 possible scores in duplicate bridge.

Multiples of ten not present: 10, 20, 30, 40, 60, 220, 290, 310, 320, 330, 370, 390, 410, 820, ..., .

a(i) can be made k ways: 1, 1, 1, 3, 3, 5, 2, 4, 5, 7, 2, 7, 6, 4, 7, 2, 5, 3, 1, 4, 2, 2, 3, 2, ..., .

Links

Jonathan Vos Post and Robert G. Wilson v, Table of n, a(n) for n = 1..204

American Contract Bridge League, How to keep score

Wikipedia, Bridge scoring

Example

50 is in the sequence because if opponents, "They", bid something and are down by one, "We" score 50.
70 is in the sequence because if "We" bid one minor suit, either Clubs or Diamonds, "We" score 70.
100 is possible three different ways: Down one vulnerable, down one not vulnerable doubled and down two not vulnerable.

Crossrefs

Cf. A114959.

Sequence in context: A180103 A102803 A224559 * A224552 A039473 A309123

Adjacent sequences: A272604 A272605 A272606 * A272608 A272609 A272610

Keyword

easy,fini,full,nonn

Author

Jonathan Vos Post and Robert G. Wilson v, Nov 09 2016

Status

approved