A341734 a(n) = A007678(2*n)/(2*n).

0, 1, 4, 10, 22, 37, 68, 106, 137, 225, 310, 376, 538, 685, 716, 1058, 1288, 1471, 1842, 2170, 2327, 2941, 3388, 3734, 4412, 4993, 5444, 6306, 7042, 7391, 8680, 9586, 10289, 11585, 12682, 13628, 15078, 16381, 17440, 19210, 20740, 21899, 24038, 25810, 27245, 29613, 31648, 33418, 35992, 38305

Offset

1,3

Comments

This is the number of cells in a 1/(2*n)-th sector of a regular (2*n)-gon with all diagonals drawn. See Rubinstein's illustrations in A007678.

Links

Scott R. Shannon, Table of n, a(n) for n = 1..71

Example

If we divide a regular hexagon with all diagonals drawn into 6 sectors (or pizza slices), each sector contains three triangles and one quadrilateral (cf. A331450), so a(3) = A007678(6)/6 = 24/6 = 4.

Crossrefs

Cf. A007678, A331450, A341735.

Row sums of triangle in A342268.

Sequence in context: A008178 A009891 A301077 * A008255 A008031 A339609

Adjacent sequences: A341731 A341732 A341733 * A341735 A341736 A341737

Keyword

nonn

Author

Scott R. Shannon and N. J. A. Sloane, Mar 07 2021

Status

approved