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.

A143815 Let A(0)=1, B(0)=0 and C(0)=0. Let B(n+1) = Sum_{k = 0..n} binomial(n,k)*A(k), C(n+1) = Sum_{k = 0..n} binomial(n,k)*B(k) and A(n+1) = Sum_{k = 0..n} binomial(n,k)*C(k). This entry gives the sequence A(n).

Table of values

n a(n)
0 1
1 0
2 0
3 1
4 6
5 25
6 91
7 322
8 1232
9 5672
10 32202
11 209143
12 1432454
13 9942517
14 69363840
15 490303335
16 3565609732
17 27118060170
18 218183781871
19 1861370544934
20 16729411124821
21 156706028787827
22 1514442896327792
23 14999698898942772
24 151838974745743228
25 1571513300578303070

List of values

[1, 0, 0, 1, 6, 25, 91, 322, 1232, 5672, 32202, 209143, 1432454, 9942517, 69363840, 490303335, 3565609732, 27118060170, 218183781871, 1861370544934, 16729411124821, 156706028787827, 1514442896327792, 14999698898942772, 151838974745743228, 1571513300578303070]