Number of self-avoiding walks on square lattice rotated by Pi/4, with wedge angle Pi/2.

Terms

a(0) =1a(1) =3a(2) =5a(3) =15a(4) =29a(5) =83a(6) =179a(7) =495a(8) =1125a(9) =3063a(10) =7179a(11) =19401a(12) =46363a(13) =124673a(14) =302271a(15) =809921a(16) =1984959a(17) =5304947a(18) =13110907a(19) =34972559a(20) =87014349a(21) =231756983a(22) =579803757a(23) =1542417375a(24) =3876465993a(25) =10302282907a(26) =25992403975a(27) =69023035049a(28) =174720823645