Numbers of espalier polycubes of a given volume in dimension 4.

Terms

a(0) =1a(1) =4a(2) =7a(3) =16a(4) =22a(5) =46a(6) =58a(7) =107a(8) =140a(9) =227a(10) =287a(11) =464a(12) =563a(13) =851a(14) =1067a(15) =1530a(16) =1866a(17) =2661a(18) =3198a(19) =4428a(20) =5361a(21) =7185a(22) =8613a(23) =11524a(24) =13639a(25) =17839a(26) =21272a(27) =27359a(28) =32300a(29) =41369