A136289 - cp's OEIS frontend

A136289 Start with three pennies touching each other on a tabletop. In each generation, add pennies subject to the rule that a penny can be placed only when (at least) two pennies are already in position to determine its position; sequence gives number of pennies added at generation n.

n	a(n)
0	3
1	3
2	6
3	9
4	9
5	12
6	15
7	15
8	18
9	21
10	21
11	24
12	27
13	27
14	30
15	33
16	33
17	36
18	39
19	39
20	42
21	45
22	45
23	48
24	51
25	51
26	54
27	57
28	57
29	60
30	63
31	63
32	66
33	69
34	69
35	72
36	75
37	75
38	78
39	81
40	81
41	84
42	87
43	87
44	90
45	93
46	93
47	96
48	99
49	99
50	102
51	105
52	105
53	108
54	111
55	111
56	114
57	117
58	117
59	120
60	123
61	123
62	126
63	129
64	129
65	132

[3, 3, 6, 9, 9, 12, 15, 15, 18, 21, 21, 24, 27, 27, 30, 33, 33, 36, 39, 39, 42, 45, 45, 48, 51, 51, 54, 57, 57, 60, 63, 63, 66, 69, 69, 72, 75, 75, 78, 81, 81, 84, 87, 87, 90, 93, 93, 96, 99, 99, 102, 105, 105, 108, 111, 111, 114, 117, 117, 120, 123, 123, 126, 129, 129, 132]

cp's OEIS Frontend

A136289 Start with three pennies touching each other on a tabletop. In each generation, add pennies subject to the rule that a penny can be placed only when (at least) two pennies are already in position to determine its position; sequence gives number of pennies added at generation n.

Table of values

List of values

n	a(n)
0	3
1	3
2	6
3	9
4	9
5	12
6	15
7	15
8	18
9	21
10	21
11	24
12	27
13	27
14	30
15	33
16	33
17	36
18	39
19	39
20	42
21	45
22	45
23	48
24	51
25	51
26	54
27	57
28	57
29	60
30	63
31	63
32	66
33	69
34	69
35	72
36	75
37	75
38	78
39	81
40	81
41	84
42	87
43	87
44	90
45	93
46	93
47	96
48	99
49	99
50	102
51	105
52	105
53	108
54	111
55	111
56	114
57	117
58	117
59	120
60	123
61	123
62	126
63	129
64	129
65	132

n	a(n)
0	3
1	3
2	6
3	9
4	9
5	12
6	15
7	15
8	18
9	21
10	21
11	24
12	27
13	27
14	30
15	33
16	33
17	36
18	39
19	39
20	42
21	45
22	45
23	48
24	51
25	51
26	54
27	57
28	57
29	60
30	63
31	63
32	66
33	69
34	69
35	72
36	75
37	75
38	78
39	81
40	81
41	84
42	87
43	87
44	90
45	93
46	93
47	96
48	99
49	99
50	102
51	105
52	105
53	108
54	111
55	111
56	114
57	117
58	117
59	120
60	123
61	123
62	126
63	129
64	129
65	132

n	a(n)
0	3
1	3
2	6
3	9
4	9
5	12
6	15
7	15
8	18
9	21
10	21
11	24
12	27
13	27
14	30
15	33
16	33
17	36
18	39
19	39
20	42
21	45
22	45
23	48
24	51
25	51
26	54
27	57
28	57
29	60
30	63
31	63
32	66
33	69
34	69
35	72
36	75
37	75
38	78
39	81
40	81
41	84
42	87
43	87
44	90
45	93
46	93
47	96
48	99
49	99
50	102
51	105
52	105
53	108
54	111
55	111
56	114
57	117
58	117
59	120
60	123
61	123
62	126
63	129
64	129
65	132