A332606 Number of triangles in the graph formed by drawing the lines connecting any two of the 2*(n+2) perimeter points of a 3 X (n+1) rectangular grid of points (or equally, a 2 X n grid of squares).

14, 48, 102, 192, 326, 524, 802, 1192, 1634, 2296, 3074, 4052, 5246, 6740, 8398, 10440, 12770, 15512, 18782, 22384, 26386, 31204, 36482, 42232, 48826, 56508, 64318, 73356, 83366, 93996, 106010, 118788, 132634, 148600, 164814, 182648, 201998, 223172, 245634

Offset

1,1

Comments

See A331452 (the illustrations for T(n,2)) for pictures of these graphs.

Links

Lars Blomberg, Table of n, a(n) for n = 1..100

Scott R. Shannon, Data specifically for nX2 (or 2Xn) rectangles

Crossrefs

Cf. A331452, A331453, A331454, A331763, A331765, A331766, A332599, A332600, A331457, A332607, A332608, A332609.

Sequence in context: A013323 A205475 A205753 * A232826 A205468 A195966

Adjacent sequences: A332603 A332604 A332605 * A332607 A332608 A332609

Keyword

nonn

Author

Scott R. Shannon and N. J. A. Sloane, Mar 12 2020

Extensions

a(21) and beyond from Lars Blomberg, Apr 28 2020

Status

approved