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.

A387272 a(n) = Sum_{k=0..n} 2^(n-k) * binomial(n+2,k+2) * binomial(2*k+4,k+4).

Table of values

n a(n)
0 1
1 12
2 100
3 720
4 4815
5 30884
6 193144
7 1188576
8 7236690
9 43741720
10 263056728
11 1576298464
12 9421080123
13 56200937940
14 334801389360
15 1992471776448
16 11848869296622
17 70425535830696
18 418426332826200
19 2485390365370080
20 14760336569524854
21 87650482093915752

List of values

[1, 12, 100, 720, 4815, 30884, 193144, 1188576, 7236690, 43741720, 263056728, 1576298464, 9421080123, 56200937940, 334801389360, 1992471776448, 11848869296622, 70425535830696, 418426332826200, 2485390365370080, 14760336569524854, 87650482093915752]

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

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