Number of admissible 2-dimensional lattice patterns of type Sigma(2,3,5).

Terms

a(0) =2a(1) =4a(2) =8a(3) =16a(4) =30a(5) =60a(6) =120a(7) =240a(8) =452a(9) =904a(10) =1708a(11) =3416a(12) =6832a(13) =12860a(14) =25720a(15) =48720a(16) =97440a(17) =184704a(18) =369408a(19) =738816a(20) =1390768a(21) =2625128a(22) =5250256a(23) =9979776a(24) =19959552