Demi-tribonacci numbers (rounding down): a(0)=a(1)=0, a(2)=2; a(n) = floor( (a(n-1)+a(n-2)+a(n-3))/2 ).
A180234
Demi-tribonacci numbers (rounding down): a(0)=a(1)=0, a(2)=2; a(n) = floor( (a(n-1)+a(n-2)+a(n-3))/2 ).
Terms
- a(0) =0a(1) =0a(2) =2a(3) =1a(4) =1a(5) =2a(6) =2a(7) =2a(8) =3a(9) =3a(10) =4a(11) =5a(12) =6a(13) =7a(14) =9a(15) =11a(16) =13a(17) =16a(18) =20a(19) =24a(20) =30a(21) =37a(22) =45a(23) =56a(24) =69a(25) =85a(26) =105a(27) =129a(28) =159a(29) =196
External references
- oeis: A180234