Number of meaningful differential operations of the n-th order on the space R^6.

Terms

a(0) =6a(1) =10a(2) =16a(3) =26a(4) =42a(5) =68a(6) =110a(7) =178a(8) =288a(9) =466a(10) =754a(11) =1220a(12) =1974a(13) =3194a(14) =5168a(15) =8362a(16) =13530a(17) =21892a(18) =35422a(19) =57314a(20) =92736a(21) =150050a(22) =242786a(23) =392836a(24) =635622a(25) =1028458a(26) =1664080a(27) =2692538a(28) =4356618a(29) =7049156