A225386 - cp's OEIS frontend

A225386 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 Q.

n	a(n)
1	2
2	6
3	11
4	18
5	26
6	36
7	48
8	61
9	75
10	90
11	106
12	123
13	142
14	163
15	185
16	208
17	232
18	257
19	284
20	312
21	341
22	371
23	402
24	434
25	467
26	501
27	536
28	573
29	612
30	652
31	693
32	735
33	778
34	822
35	867
36	913
37	960
38	1009
39	1059
40	1110
41	1162
42	1215
43	1269
44	1324
45	1380
46	1437
47	1495
48	1554
49	1614
50	1676
51	1739
52	1804
53	1870
54	1937
55	2005
56	2074
57	2144

[2, 6, 11, 18, 26, 36, 48, 61, 75, 90, 106, 123, 142, 163, 185, 208, 232, 257, 284, 312, 341, 371, 402, 434, 467, 501, 536, 573, 612, 652, 693, 735, 778, 822, 867, 913, 960, 1009, 1059, 1110, 1162, 1215, 1269, 1324, 1380, 1437, 1495, 1554, 1614, 1676, 1739, 1804, 1870, 1937, 2005, 2074, 2144]

cp's OEIS Frontend

A225386 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 Q.

Table of values

List of values