Number of partitions of n where the difference between consecutive parts is at most 3.

Terms

a(0) =1a(1) =1a(2) =2a(3) =3a(4) =5a(5) =7a(6) =10a(7) =13a(8) =18a(9) =24a(10) =32a(11) =41a(12) =54a(13) =68a(14) =87a(15) =111a(16) =139a(17) =174a(18) =218a(19) =269a(20) =333a(21) =410a(22) =501a(23) =611a(24) =745a(25) =902a(26) =1090a(27) =1315a(28) =1578a(29) =1891