13947137604
domain: N
Appears in sequences
- Expansion of (1+x)/(1-3*x).at n=21A003946
- a(1)=1, a(2)=2, a(n) = 4*3^(n-3) for n >= 3.at n=22A025579
- a(n) = Sum_{k=0..m} (k+1) * A026120(n, m-k), where m=0 for n=0,1; m=n for n >= 2.at n=21A027327
- Number of compositions of n into 2*j-1 kinds of j's for all j>=1.at n=22A052156
- a(n) = (7*3^n - (-3)^n)/6.at n=21A133125
- Number of reduced words of length n in Coxeter group on 4 generators S_i with relations (S_i)^2 = (S_i S_j)^22 = I.at n=21A168921
- Number of reduced words of length n in Coxeter group on 4 generators S_i with relations (S_i)^2 = (S_i S_j)^23 = I.at n=21A168969
- Number of reduced words of length n in Coxeter group on 4 generators S_i with relations (S_i)^2 = (S_i S_j)^24 = I.at n=21A169017
- Number of reduced words of length n in Coxeter group on 4 generators S_i with relations (S_i)^2 = (S_i S_j)^25 = I.at n=21A169065
- Number of reduced words of length n in Coxeter group on 4 generators S_i with relations (S_i)^2 = (S_i S_j)^26 = I.at n=21A169113
- Number of reduced words of length n in Coxeter group on 4 generators S_i with relations (S_i)^2 = (S_i S_j)^27 = I.at n=21A169161
- Number of reduced words of length n in Coxeter group on 4 generators S_i with relations (S_i)^2 = (S_i S_j)^28 = I.at n=21A169209
- Number of reduced words of length n in Coxeter group on 4 generators S_i with relations (S_i)^2 = (S_i S_j)^29 = I.at n=21A169257
- Number of reduced words of length n in Coxeter group on 4 generators S_i with relations (S_i)^2 = (S_i S_j)^30 = I.at n=21A169305
- Number of reduced words of length n in Coxeter group on 4 generators S_i with relations (S_i)^2 = (S_i S_j)^31 = I.at n=21A169353
- Number of reduced words of length n in Coxeter group on 4 generators S_i with relations (S_i)^2 = (S_i S_j)^32 = I.at n=21A169401
- Number of reduced words of length n in Coxeter group on 4 generators S_i with relations (S_i)^2 = (S_i S_j)^33 = I.at n=21A169449
- Number of reduced words of length n in Coxeter group on 4 generators S_i with relations (S_i)^2 = (S_i S_j)^34 = I.at n=21A169497
- Number of reduced words of length n in Coxeter group on 4 generators S_i with relations (S_i)^2 = (S_i S_j)^35 = I.at n=21A169545
- Number of reduced words of length n in Coxeter group on 4 generators S_i with relations (S_i)^2 = (S_i S_j)^36 = I.at n=21A170013