Number of strategic configurations in 3 X n Chomp rectangle.

Terms

a(0) =0a(1) =1a(2) =3a(3) =5a(4) =7a(5) =10a(6) =13a(7) =17a(8) =20a(9) =25a(10) =29a(11) =33a(12) =39a(13) =44a(14) =51a(15) =56a(16) =62a(17) =70a(18) =76a(19) =85a(20) =92a(21) =100a(22) =110a(23) =121a(24) =129a(25) =137a(26) =149a(27) =158a(28) =167a(29) =180