Number of isomorphism classes of separated dissections of an equilateral triangle into n nonoverlapping equilateral triangles.
A167123
Number of isomorphism classes of separated dissections of an equilateral triangle into n nonoverlapping equilateral triangles.
Terms
- a(0) =1a(1) =0a(2) =0a(3) =1a(4) =0a(5) =1a(6) =2a(7) =3a(8) =8a(9) =20a(10) =55a(11) =161a(12) =478a(13) =1496a(14) =4804a(15) =15589a(16) =51377a(17) =172162a(18) =583810a(19) =1998407
External references
- oeis: A167123