A226423 Number of nondecreasing -n..n vectors of length 2 whose dot product with some lexicographically greater or equal nondecreasing -n..n vector equals 2.

3, 11, 17, 25, 36, 47, 62, 78, 94, 116, 142, 158, 189, 221, 242, 274, 314, 346, 392, 423, 454, 508, 563, 595, 646, 709, 755, 803, 874, 917, 992, 1054, 1105, 1190, 1251, 1298, 1389, 1485, 1546, 1609, 1709, 1772, 1878, 1956, 2017, 2134, 2249, 2313, 2418, 2522

Offset

1,1

Comments

Row 2 of A226422.

Links

R. H. Hardin, Table of n, a(n) for n = 1..210

Example

Some solutions for n=3
.-2....0...-3...-3...-3...-2...-1...-2...-2....1...-1...-2...-1...-2....0...-3
..2....2...-2....1....2....1...-1....3....0....1....2...-2....3...-1....1...-1

Crossrefs

Cf. A226422.

Sequence in context: A136082 A106083 A113803 * A045431 A126691 A154613

Adjacent sequences: A226420 A226421 A226422 * A226424 A226425 A226426

Keyword

nonn

Author

R. H. Hardin, Jun 06 2013

Status

approved