Number of canyon polycubes of a given volume.

Terms

a(0) =1a(1) =3a(2) =7a(3) =16a(4) =35a(5) =73a(6) =151a(7) =304a(8) =604a(9) =1198a(10) =2362a(11) =4637a(12) =9117a(13) =17954a(14) =35350a(15) =69760a(16) =137959a(17) =273213a(18) =542015a(19) =1076870a(20) =2141996a(21) =4265350a(22) =8501015a(23) =16954408a(24) =33833943a(25) =67549763a(26) =134912857a(27) =269532456a(28) =538603324a(29) =1076479708