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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.

A386986 a(n) = Sum_{k=0..n} (k+1) * 8^k * binomial(2*n+2,n-k).

Table of values

n a(n)
0 1
1 20
2 303
3 4088
4 51730
5 628488
6 7423899
7 85904688
8 978506478
9 11008191800
10 122603713078
11 1354213651728
12 14854030654372
13 161966063719712
14 1757042561230515
15 18976059641899872
16 204140891541240918
17 2188510439907779064
18 23389705325379996834
19 249285017279237071440

List of values

[1, 20, 303, 4088, 51730, 628488, 7423899, 85904688, 978506478, 11008191800, 122603713078, 1354213651728, 14854030654372, 161966063719712, 1757042561230515, 18976059641899872, 204140891541240918, 2188510439907779064, 23389705325379996834, 249285017279237071440]

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

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