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

Terms

a(0) =1a(1) =4a(2) =10a(3) =25a(4) =55a(5) =109a(6) =211a(7) =371a(8) =651a(9) =1092a(10) =1767a(11) =2775a(12) =4383a(13) =6666a(14) =9990a(15) =14806a(16) =21695a(17) =31265a(18) =44852a(19) =63365a(20) =89132a(21) =124250a(22) =171560a(23) =235140a(24) =321661a(25) =435670a(26) =587219a(27) =787663a(28) =1051669a(29) =1396309