Number of pyramid polycubes of a given volume in dimension 3.

Terms

a(0) =1a(1) =3a(2) =7a(3) =16a(4) =33a(5) =63a(6) =117a(7) =202a(8) =344a(9) =566a(10) =908a(11) =1419a(12) =2206a(13) =3334a(14) =4988a(15) =7378a(16) =10778a(17) =15535a(18) =22281a(19) =31547a(20) =44405a(21) =62011a(22) =85939a(23) =118281a(24) =162136a(25) =220494a(26) =298531a(27) =402163a(28) =539181a(29) =719301