Generalized Fibonacci numbers.

Terms

a(0) =0a(1) =1a(2) =1a(3) =7a(4) =13a(5) =55a(6) =133a(7) =463a(8) =1261a(9) =4039a(10) =11605a(11) =35839a(12) =105469a(13) =320503a(14) =953317a(15) =2876335a(16) =8596237a(17) =25854247a(18) =77431669a(19) =232557151a(20) =697147165a(21) =2092490071a(22) =6275373061a(23) =18830313487a(24) =56482551853a(25) =169464432775a(26) =508359743893