A368481 - cp's OEIS frontend

A368481 The degree of polynomials related to Somos-5 sequences. Also for n > 4 the degree of the (n-4)-th involution in a family of involutions in the Cremona group of rank 4 defined by a Somos-5 sequence.

n	a(n)
0	0
1	0
2	0
3	0
4	0
5	2
6	3
7	4
8	6
9	9
10	11
11	14
12	18
13	22
14	25
15	30
16	35
17	40
18	45
19	52
20	58
21	64
22	71
23	79
24	86
25	94
26	103
27	112
28	120
29	130
30	140
31	150
32	160
33	172
34	183
35	194
36	206
37	219
38	231
39	244
40	258
41	272
42	285
43	300
44	315
45	330
46	345
47	362
48	378
49	394
50	411
51	429
52	446
53	464
54	483
55	502
56	520
57	540
58	560
59	580
60	600
61	622
62	643
63	664
64	686
65	709

[0, 0, 0, 0, 0, 2, 3, 4, 6, 9, 11, 14, 18, 22, 25, 30, 35, 40, 45, 52, 58, 64, 71, 79, 86, 94, 103, 112, 120, 130, 140, 150, 160, 172, 183, 194, 206, 219, 231, 244, 258, 272, 285, 300, 315, 330, 345, 362, 378, 394, 411, 429, 446, 464, 483, 502, 520, 540, 560, 580, 600, 622, 643, 664, 686, 709]

cp's OEIS Frontend

A368481 The degree of polynomials related to Somos-5 sequences. Also for n > 4 the degree of the (n-4)-th involution in a family of involutions in the Cremona group of rank 4 defined by a Somos-5 sequence.

Table of values

List of values

n	a(n)
0	0
1	0
2	0
3	0
4	0
5	2
6	3
7	4
8	6
9	9
10	11
11	14
12	18
13	22
14	25
15	30
16	35
17	40
18	45
19	52
20	58
21	64
22	71
23	79
24	86
25	94
26	103
27	112
28	120
29	130
30	140
31	150
32	160
33	172
34	183
35	194
36	206
37	219
38	231
39	244
40	258
41	272
42	285
43	300
44	315
45	330
46	345
47	362
48	378
49	394
50	411
51	429
52	446
53	464
54	483
55	502
56	520
57	540
58	560
59	580
60	600
61	622
62	643
63	664
64	686
65	709

n	a(n)
0	0
1	0
2	0
3	0
4	0
5	2
6	3
7	4
8	6
9	9
10	11
11	14
12	18
13	22
14	25
15	30
16	35
17	40
18	45
19	52
20	58
21	64
22	71
23	79
24	86
25	94
26	103
27	112
28	120
29	130
30	140
31	150
32	160
33	172
34	183
35	194
36	206
37	219
38	231
39	244
40	258
41	272
42	285
43	300
44	315
45	330
46	345
47	362
48	378
49	394
50	411
51	429
52	446
53	464
54	483
55	502
56	520
57	540
58	560
59	580
60	600
61	622
62	643
63	664
64	686
65	709

n	a(n)
0	0
1	0
2	0
3	0
4	0
5	2
6	3
7	4
8	6
9	9
10	11
11	14
12	18
13	22
14	25
15	30
16	35
17	40
18	45
19	52
20	58
21	64
22	71
23	79
24	86
25	94
26	103
27	112
28	120
29	130
30	140
31	150
32	160
33	172
34	183
35	194
36	206
37	219
38	231
39	244
40	258
41	272
42	285
43	300
44	315
45	330
46	345
47	362
48	378
49	394
50	411
51	429
52	446
53	464
54	483
55	502
56	520
57	540
58	560
59	580
60	600
61	622
62	643
63	664
64	686
65	709