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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.

A362351 a(n) = n! * Sum_{k=0..floor(n/3)} (k/6)^k / (k! * (n-3*k)!).

Table of values

n a(n)
0 1
1 1
2 1
3 2
4 5
5 11
6 61
7 316
8 1177
9 11005
10 84121
11 434446
12 5642781
13 56725527
14 374014005
15 6211205456
16 77331975281
17 620174850521
18 12539310726577
19 186125334960730
20 1757911008913141
21 41887694462674691
22 721886016954223661
23 7846403629258814852
24 215270385425700640905

List of values

[1, 1, 1, 2, 5, 11, 61, 316, 1177, 11005, 84121, 434446, 5642781, 56725527, 374014005, 6211205456, 77331975281, 620174850521, 12539310726577, 186125334960730, 1757911008913141, 41887694462674691, 721886016954223661, 7846403629258814852, 215270385425700640905]

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

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