a(n) = 3*a(n-3) + 3*a(n-6) + a(n-9) for n>8, a(0)=0, a(1)=a(2)=1, a(3)=a(4)=2, a(5)=3, a(6)=7, a(7)=9, a(8)=11.

A237988

a(n) = 3*a(n-3) + 3*a(n-6) + a(n-9) for n>8, a(0)=0, a(1)=a(2)=1, a(3)=a(4)=2, a(5)=3, a(6)=7, a(7)=9, a(8)=11.

Terms

    a(0) =0a(1) =1a(2) =1a(3) =2a(4) =2a(5) =3a(6) =7a(7) =9a(8) =11a(9) =27a(10) =34a(11) =43a(12) =104a(13) =131a(14) =165a(15) =400a(16) =504a(17) =635a(18) =1539a(19) =1939a(20) =2443a(21) =5921a(22) =7460a(23) =9399a(24) =22780a(25) =28701a(26) =36161a(27) =87642a(28) =110422a(29) =139123

External references