G.f.: 1/(1 - x - x^2 - 2*x^3 - 3*x^4 - 2*x^5 - x^6).

Terms

a(0) =1a(1) =1a(2) =2a(3) =5a(4) =12a(5) =26a(6) =57a(7) =127a(8) =284a(9) =632a(10) =1405a(11) =3126a(12) =6958a(13) =15485a(14) =34458a(15) =76679a(16) =170638a(17) =379730a(18) =845028a(19) =1880472a(20) =4184690a(21) =9312363a(22) =20723179a(23) =46116124a(24) =102624071a(25) =228373494a(26) =508208766a(27) =1130937495a(28) =2516720889a(29) =5600560664