Construct sequences P,Q,R by the rules: Q = first differences of P, R = second differences of P, P starts with 1,3,9, Q starts with 2,6, R starts with 4; at each stage the smallest number not yet present in P,Q,R is appended to R. Sequence gives P.
A225385
Construct sequences P,Q,R by the rules: Q = first differences of P, R = second differences of P, P starts with 1,3,9, Q starts with 2,6, R starts with 4; at each stage the smallest number not yet present in P,Q,R is appended to R. Sequence gives P.
Terms
- a(0) =1a(1) =3a(2) =9a(3) =20a(4) =38a(5) =64a(6) =100a(7) =148a(8) =209a(9) =284a(10) =374a(11) =480a(12) =603a(13) =745a(14) =908a(15) =1093a(16) =1301a(17) =1533a(18) =1790a(19) =2074a(20) =2386a(21) =2727a(22) =3098a(23) =3500a(24) =3934a(25) =4401a(26) =4902a(27) =5438a(28) =6011a(29) =6623
External references
- oeis: A225385