122222222222
domain: N
Appears in sequences
- Number of nodes on a tree with degree 11 interior nodes and degree 1 boundary nodes.at n=11A090843
- a(n) = (n*10^n - n + 9)/9.at n=11A091693
- Expansion of g.f. x*(1+11*x+x^2)/((1-x)*(1+x)*(1-10*x^2)).at n=23A094624
- Expansion of x*(1+x)/((1-x)*(1-10*x^2)).at n=23A094626
- Base 3 representation of the positive integers n such that Sum[d[k],k=1..n] is an integer, where d(k) is the base 3 fraction 0.k (e.g., d(22 base 10)=d(211 base 3)=0.221 base 3).at n=15A107483
- First elements of the pairs listed in A134514.at n=20A134584