Number of compositions of n into parts 1, 6, and 7.

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =2a(7) =4a(8) =6a(9) =8a(10) =10a(11) =12a(12) =15a(13) =21a(14) =31a(15) =45a(16) =63a(17) =85a(18) =112a(19) =148a(20) =200a(21) =276a(22) =384a(23) =532a(24) =729a(25) =989a(26) =1337a(27) =1813a(28) =2473a(29) =3389