Number of compositions of 7*n-4 into parts 6 and 7.

Terms

a(0) =0a(1) =0a(2) =0a(3) =1a(4) =5a(5) =15a(6) =35a(7) =70a(8) =126a(9) =211a(10) =342a(11) =573a(12) =1079a(13) =2366a(14) =5733a(15) =14197a(16) =34223a(17) =78832a(18) =173166a(19) =364876a(20) =745066a(21) =1493990a(22) =2985725a(23) =6030652a(24) =12428911a(25) =26199706a(26) =56231526a(27) =121847272a(28) =264270015a(29) =570020037