A054993 - cp's OEIS frontend

A054993 Number of "long curves", i.e., topological types of smooth embeddings of the oriented real line into the oriented plane that coincide with the standard immersion x -> (x,0) in the neighborhood of -infinity and +infinity.

n	a(n)
0	1
1	2
2	8
3	42
4	260
5	1796
6	13396
7	105706
8	870772
9	7420836
10	65004584
11	582521748
12	5320936416
13	49402687392
14	465189744448
15	4434492302426
16	42731740126228
17	415736458808868
18	4079436831493480
19	40338413922226212
20	401652846850965808
21	4024556509468827432
22	40558226664529024000
23	410887438338905738908
24	4182776248940752113344
25	42770152711524569532616
26	439143340987014152920384
27	4526179842103708969039296

[1, 2, 8, 42, 260, 1796, 13396, 105706, 870772, 7420836, 65004584, 582521748, 5320936416, 49402687392, 465189744448, 4434492302426, 42731740126228, 415736458808868, 4079436831493480, 40338413922226212, 401652846850965808, 4024556509468827432, 40558226664529024000, 410887438338905738908, 4182776248940752113344, 42770152711524569532616, 439143340987014152920384, 4526179842103708969039296]

cp's OEIS Frontend

A054993 Number of "long curves", i.e., topological types of smooth embeddings of the oriented real line into the oriented plane that coincide with the standard immersion x -> (x,0) in the neighborhood of -infinity and +infinity.

Table of values

List of values