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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.

A387307 a(n) = Sum_{k=0..n} 2^k * binomial(n+2,k+2) * binomial(2*k+4,k+4).

Table of values

n a(n)
0 1
1 15
2 166
3 1650
4 15615
5 144025
6 1309084
7 11793780
8 105663885
9 943298675
10 8401596258
11 74716379270
12 663813240363
13 5894026429725
14 52314876771960
15 464261939106600
16 4119843554861913
17 36560929542771735
18 324489293583792990
19 2880380080564191450
20 25572856871556696471

List of values

[1, 15, 166, 1650, 15615, 144025, 1309084, 11793780, 105663885, 943298675, 8401596258, 74716379270, 663813240363, 5894026429725, 52314876771960, 464261939106600, 4119843554861913, 36560929542771735, 324489293583792990, 2880380080564191450, 25572856871556696471]

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

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