36840651123
domain: N
Appears in sequences
- a(n+1) - 3*a(n) + a(n-1) = (2/3)(1+w^(n+1)+w^(2n+2)), where w = exp(2 Pi I / 3).at n=26A071618
- a(n) = numerator of Sum_{i=1..n} binomial(2n-i-1,i-1)/i.at n=25A175385
- Half the number of n X 2 binary arrays with every element equal to exactly one or two of its horizontal and vertical neighbors.at n=25A185828
- Indices of triangular numbers (A000217) that are also centered pentagonal numbers (A005891).at n=17A254626
- Partial sums of the Lucas numbers of the form L(3n+2) (A163063).at n=16A307268