A192521 - cp's OEIS frontend

A192521 Monotonic ordering of set S generated by these rules: if x and y are in S then floor((x+1)(y+1)/2) is in S, and 2 is in S.

n	a(n)
1	2
2	4
3	7
4	12
5	19
6	20
7	30
8	31
9	32
10	46
11	48
12	49
13	50
14	52
15	70
16	73
17	75
18	76
19	77
20	79
21	80
22	82
23	84
24	106
25	111
26	114
27	115
28	117
29	120
30	121
31	122
32	124
33	125
34	127
35	128
36	130
37	132
38	136
39	160
40	168
41	172
42	174
43	177
44	181
45	183
46	184
47	185
48	187
49	188
50	189
51	190
52	192
53	193
54	195
55	196
56	199
57	200

[2, 4, 7, 12, 19, 20, 30, 31, 32, 46, 48, 49, 50, 52, 70, 73, 75, 76, 77, 79, 80, 82, 84, 106, 111, 114, 115, 117, 120, 121, 122, 124, 125, 127, 128, 130, 132, 136, 160, 168, 172, 174, 177, 181, 183, 184, 185, 187, 188, 189, 190, 192, 193, 195, 196, 199, 200]

cp's OEIS Frontend

A192521 Monotonic ordering of set S generated by these rules: if x and y are in S then floor((x+1)(y+1)/2) is in S, and 2 is in S.

Table of values

List of values

n	a(n)
1	2
2	4
3	7
4	12
5	19
6	20
7	30
8	31
9	32
10	46
11	48
12	49
13	50
14	52
15	70
16	73
17	75
18	76
19	77
20	79
21	80
22	82
23	84
24	106
25	111
26	114
27	115
28	117
29	120
30	121
31	122
32	124
33	125
34	127
35	128
36	130
37	132
38	136
39	160
40	168
41	172
42	174
43	177
44	181
45	183
46	184
47	185
48	187
49	188
50	189
51	190
52	192
53	193
54	195
55	196
56	199
57	200

n	a(n)
1	2
2	4
3	7
4	12
5	19
6	20
7	30
8	31
9	32
10	46
11	48
12	49
13	50
14	52
15	70
16	73
17	75
18	76
19	77
20	79
21	80
22	82
23	84
24	106
25	111
26	114
27	115
28	117
29	120
30	121
31	122
32	124
33	125
34	127
35	128
36	130
37	132
38	136
39	160
40	168
41	172
42	174
43	177
44	181
45	183
46	184
47	185
48	187
49	188
50	189
51	190
52	192
53	193
54	195
55	196
56	199
57	200

n	a(n)
1	2
2	4
3	7
4	12
5	19
6	20
7	30
8	31
9	32
10	46
11	48
12	49
13	50
14	52
15	70
16	73
17	75
18	76
19	77
20	79
21	80
22	82
23	84
24	106
25	111
26	114
27	115
28	117
29	120
30	121
31	122
32	124
33	125
34	127
35	128
36	130
37	132
38	136
39	160
40	168
41	172
42	174
43	177
44	181
45	183
46	184
47	185
48	187
49	188
50	189
51	190
52	192
53	193
54	195
55	196
56	199
57	200