Number of (n,3) Freiman-Wyner sequences.

Terms

a(0) =7a(1) =12a(2) =23a(3) =42a(4) =78a(5) =142a(6) =262a(7) =482a(8) =887a(9) =1630a(10) =2999a(11) =5516a(12) =10146a(13) =18660a(14) =34322a(15) =63128a(16) =116111