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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.

A128553 Column 3 of triangle A128545; a(n) is the coefficient of q^(3n+9) in the central q-binomial coefficient [2n+6,n+3].

Table of values

n a(n)
0 1
1 5
2 18
3 58
4 155
5 383
6 867
7 1860
8 3782
9 7409
10 13989
11 25683
12 45905
13 80262
14 137453
15 231269
16 382689
17 624061
18 1003787
19 1594796
20 2504587
21 3892100
22 5988403
23 9129707
24 13798792
25 20688367
26 30781988
27 45473815
28 66723042
29 97276842
30 140959603

List of values

[1, 5, 18, 58, 155, 383, 867, 1860, 3782, 7409, 13989, 25683, 45905, 80262, 137453, 231269, 382689, 624061, 1003787, 1594796, 2504587, 3892100, 5988403, 9129707, 13798792, 20688367, 30781988, 45473815, 66723042, 97276842, 140959603]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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