A037257 - cp's OEIS frontend

A037257 a() = 1,3,... [ A037257 ], differences = 2,... [ A037258 ] and 2nd differences [ A037259 ] are disjoint and monotonic; adjoin next free number to 2nd differences unless it would produce a duplicate in which case ignore.

n	a(n)
0	1
1	3
2	9
3	20
4	38
5	64
6	100
7	148
8	209
9	284
10	374
11	480
12	603
13	745
14	908
15	1093
16	1301
17	1533
18	1790
19	2075
20	2389
21	2733
22	3108
23	3515
24	3955
25	4429
26	4938
27	5484
28	6069
29	6694
30	7360
31	8068
32	8819
33	9614
34	10454
35	11340
36	12273
37	13255
38	14287
39	15370
40	16505
41	17693
42	18935
43	20232

[1, 3, 9, 20, 38, 64, 100, 148, 209, 284, 374, 480, 603, 745, 908, 1093, 1301, 1533, 1790, 2075, 2389, 2733, 3108, 3515, 3955, 4429, 4938, 5484, 6069, 6694, 7360, 8068, 8819, 9614, 10454, 11340, 12273, 13255, 14287, 15370, 16505, 17693, 18935, 20232]

cp's OEIS Frontend

A037257 a() = 1,3,... [ A037257 ], differences = 2,... [ A037258 ] and 2nd differences [ A037259 ] are disjoint and monotonic; adjoin next free number to 2nd differences unless it would produce a duplicate in which case ignore.

Table of values

List of values