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.

A373905 a(n) = Sum_{k=0..floor(n/3)} binomial(n+3*k,n-3*k).

Table of values

n a(n)
0 1
1 1
2 1
3 2
4 8
5 29
6 86
7 224
8 554
9 1381
10 3556
11 9382
12 24901
13 65737
14 172321
15 450017
16 1174985
17 3072365
18 8044478
19 21074012
20 55199573
21 144535714
22 378366976
23 990441502
24 2592800365
25 6787973872
26 17771619370
27 46527959417
28 121813193825
29 318910531073
30 834913179137

List of values

[1, 1, 1, 2, 8, 29, 86, 224, 554, 1381, 3556, 9382, 24901, 65737, 172321, 450017, 1174985, 3072365, 8044478, 21074012, 55199573, 144535714, 378366976, 990441502, 2592800365, 6787973872, 17771619370, 46527959417, 121813193825, 318910531073, 834913179137]

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

Content is available under The OEIS End-User License Agreement.