A358716 a(n) is the number of inequivalent ways to cut an equilateral triangle with edges of size n into equilateral triangles with integer sides.

1, 2, 3, 12, 50, 711, 18031, 952013, 92323440

Offset

1,2

Comments

Similar to A358715, but now we do not regard dissections which differ by a rotation and/or reflection as distinct.

Links

Table of n, a(n) for n=1..9.

Example

a(3)=3 because of:
    /\      /\      /\
   /  \    /\/\    /\/\
  /    \  /  \/\  /\/\/\

Crossrefs

Cf. A224239, A358715.

Cf. A299705.

Sequence in context: A371612 A307957 A307956 * A002638 A027072 A083746

Adjacent sequences: A358713 A358714 A358715 * A358717 A358718 A358719

Keyword

nonn,more

Author

Craig Knecht and John Mason, Nov 28 2022

Status

approved