a(n) = 3*a(n-2) + a(n-3) + a(n-5) - 3*a(n-6) - a(n-7), where a(0) = 2, a(1) = 4, a(2) = 7, a(3) = 14, a(4) = 25, a(5) = 47, a(6) = 88, a(7) = 166.

A287185

a(n) = 3*a(n-2) + a(n-3) + a(n-5) - 3*a(n-6) - a(n-7), where a(0) = 2, a(1) = 4, a(2) = 7, a(3) = 14, a(4) = 25, a(5) = 47, a(6) = 88, a(7) = 166.

Terms

    a(0) =2a(1) =4a(2) =7a(3) =14a(4) =25a(5) =47a(6) =88a(7) =166a(8) =311a(9) =586a(10) =1097a(11) =2068a(12) =3877a(13) =7301a(14) =13699a(15) =25778a(16) =48397a(17) =91033a(18) =170969a(19) =321496a(20) =603938a(21) =1135456a(22) =2133310a(23) =4010306a(24) =7535386a(25) =14164226a(26) =26616463a(27) =50028064a(28) =94013615a(29) =176700655

External references