Construct sequences P,Q,R by the rules: Q = first differences of P, R = second differences of P, P starts with 1,5,11, Q starts with 4,6, R starts with 2; at each stage the smallest number not yet present in P,Q,R is appended to R; every number appears exactly once in the union of P,Q,R. Sequence gives P.
A225376
Construct sequences P,Q,R by the rules: Q = first differences of P, R = second differences of P, P starts with 1,5,11, Q starts with 4,6, R starts with 2; at each stage the smallest number not yet present in P,Q,R is appended to R; every number appears exactly once in the union of P,Q,R. Sequence gives P.
Terms
- a(0) =1a(1) =5a(2) =11a(3) =20a(4) =36a(5) =60a(6) =94a(7) =140a(8) =199a(9) =272a(10) =360a(11) =465a(12) =588a(13) =730a(14) =893a(15) =1078a(16) =1286a(17) =1519a(18) =1778a(19) =2064a(20) =2378a(21) =2721a(22) =3094a(23) =3498a(24) =3934a(25) =4403a(26) =4907a(27) =5448a(28) =6027a(29) =6645
External references
- oeis: A225376