A242681 The number of ways that a score of n can be obtained using two darts on a standard dartboard.

1, 1, 2, 2, 3, 3, 4, 4, 5, 5, 6, 6, 7, 7, 8, 8, 9, 9, 10, 10, 11, 11, 11, 11, 12, 12, 13, 13, 13, 13, 13, 13, 14, 14, 14, 14, 14, 14, 15, 15, 15, 15, 15, 14, 15, 14, 14, 14, 14, 14, 16, 14, 15, 14, 14, 13, 15, 13, 15, 13, 13, 12, 14, 11, 14, 11, 11, 10, 11, 8, 12, 8, 8, 9, 9, 6, 10, 6, 6, 7, 6, 4, 8, 4, 4, 6, 4, 3, 7, 2, 3, 5, 2, 2, 5, 1, 2, 4, 2, 1, 4, 0, 1, 3, 0, 1, 3, 0, 1, 2, 0, 0, 2, 0, 0, 1, 0, 0, 1

Offset

2,3

Comments

It is assumed that each of the two darts scores.

Links

Table of n, a(n) for n=2..120.

Wikipedia, Darts

Example

a(2) = 1 because the only possible throw is (1,1).
a(7) = 3 because possible throws are (1,6), (2,5) and (3,4).
a(103) = 0 because it is not possible to get a score of 103.

Crossrefs

Cf. A241746, A242678, A242717, A242718.

Sequence in context: A176814 A088461 A135020 * A034888 A320467 A086388

Adjacent sequences: A242678 A242679 A242680 * A242682 A242683 A242684

Keyword

nonn,fini,full

Author

Colin Barker, May 20 2014

Status

approved