cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A244039 a(n) = 2^(2*n-1) * ( binomial(3*n/2,n) + binomial((3*n-1)/2,n) ).

Table of values

n a(n)
0 1
1 5
2 39
3 338
4 3075
5 28770
6 274134
7 2645844
8 25781283
9 253068530
10 2498678754
11 24788450076
12 246889978062
13 2467197059124
14 24725226928140
15 248396412496488
16 2500825206700323
17 25225687837101330
18 254877697946626410
19 2579123090162503500
20 26133512970919973850
21 265126176290618366460

List of values

[1, 5, 39, 338, 3075, 28770, 274134, 2645844, 25781283, 253068530, 2498678754, 24788450076, 246889978062, 2467197059124, 24725226928140, 248396412496488, 2500825206700323, 25225687837101330, 254877697946626410, 2579123090162503500, 26133512970919973850, 265126176290618366460]