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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.

A352802 Expansion of Sum_{k>=0} x^k * Product_{j=0..k-1} (j + 3 * x).

Table of values

n a(n)
0 1
1 0
2 3
3 3
4 15
5 45
6 198
7 972
8 5652
9 37881
10 289548
11 2492640
12 23906475
13 253012653
14 2930556024
15 36883817127
16 501315357690
17 7318715960511
18 114224260779891
19 1897913866979529
20 33449523840512127
21 623265596538965334
22 12241892922194658510
23 252793167644378784006

List of values

[1, 0, 3, 3, 15, 45, 198, 972, 5652, 37881, 289548, 2492640, 23906475, 253012653, 2930556024, 36883817127, 501315357690, 7318715960511, 114224260779891, 1897913866979529, 33449523840512127, 623265596538965334, 12241892922194658510, 252793167644378784006]