Number of compositions of 5*n-3 into parts 2 and 5.

Terms

a(0) =1a(1) =2a(2) =4a(3) =11a(4) =34a(5) =102a(6) =296a(7) =851a(8) =2452a(9) =7085a(10) =20489a(11) =59241a(12) =171245a(13) =494973a(14) =1430710a(15) =4135527a(16) =11953991a(17) =34553692a(18) =99879234a(19) =288705927a(20) =834519021a(21) =2412219633a(22) =6972643768a(23) =20154781952a(24) =58258423000a(25) =168398935968a(26) =486765693153