login
The OEIS Foundation is supported by donations from users of the OEIS and by a grant from the Simons Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)

A006251 as a simple table

n a(n)
0 1
1 1
2 2
3 4
4 10
5 26
6 75
7 225
8 711
9 2311
10 7725
11 26313
12 91141
13 319749
14 1134234
15 4060128
16 14648614
17 53208998
18 194423568
19 714130372
20 2635256408
21 9764995800
22 36320086418
23 135548135854
24 507434502474
25 1904982684106
26 7170113287574
27 27051804890638
28 102287657120454
29 387558371409606
30 1471212825012499
31 5594771416613721

[1,1,2,4,10,26,75,225,711,2311,7725,26313,91141,
 319749,1134234,4060128,14648614,53208998,
 194423568,714130372,2635256408,9764995800,
 36320086418,135548135854,507434502474,
 1904982684106,7170113287574,27051804890638,
 102287657120454,387558371409606,1471212825012499,
 5594771416613721]

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified January 22 03:32 EST 2021. Contains 340360 sequences. (Running on oeis4.)