A255894 Polyiamond Family Planners: a(n) is the least number of children of a polyiamond of size n.

1, 1, 1, 3, 1, 3, 1, 3, 2, 2, 2, 5, 1, 3

Offset

0,4

Links

Table of n, a(n) for n=0..13.

Example

a(7) = 3 because the 7-triangle polyiamond
  ____________
  \          /\
   \        /  \
    \      /    \  a
     \    /      \
      \  /        \      b
       \/__________\___________
       /\          /\          /
      /  \        /  \        /
     /    \      /    \      /
    /      \    /      \    /  c
   /        \  /        \  /
  /__________\/__________\/
  \          /
   \        /
    \      /
     \    /
      \  /
       \/
has three 8-triangle children created by adding a triangle to position a, b or c.

Crossrefs

Cf. A000577, A255890.

Sequence in context: A372834 A335182 A319992 * A377403 A135023 A367805

Adjacent sequences: A255891 A255892 A255893 * A255895 A255896 A255897

Keyword

nonn,more

Author

Gordon Hamilton, Mar 09 2015

Status

approved