Demi-tribonacci numbers (rounding up): a(0)=a(1)=0, a(2)=2; a(n) = ceiling( (a(n-1)+a(n-2)+a(n-3))/2 ).
A180235
Demi-tribonacci numbers (rounding up): a(0)=a(1)=0, a(2)=2; a(n) = ceiling( (a(n-1)+a(n-2)+a(n-3))/2 ).
Terms
- a(0) =0a(1) =0a(2) =2a(3) =1a(4) =2a(5) =3a(6) =3a(7) =4a(8) =5a(9) =6a(10) =8a(11) =10a(12) =12a(13) =15a(14) =19a(15) =23a(16) =29a(17) =36a(18) =44a(19) =55a(20) =68a(21) =84a(22) =104a(23) =128a(24) =158a(25) =195a(26) =241a(27) =297a(28) =367a(29) =453
External references
- oeis: A180235