Number of ways associated with A088959.

Terms

a(0) =0a(1) =1a(2) =2a(3) =4a(4) =7a(5) =13a(6) =22a(7) =31a(8) =40a(9) =67a(10) =94a(11) =121a(12) =202a(13) =283a(14) =364a(15) =607a(16) =850a(17) =1093a(18) =1822a(19) =2551a(20) =3280a(21) =5467a(22) =7654a(23) =9112a(24) =9841a(25) =12757a(26) =16402a(27) =22963a(28) =27337a(29) =29524