63126

Appears in sequences

• Iccanobif numbers: add previous two terms and reverse the sum.at n=24A014258
• Exponential Riordan array [e^(x/(1-x)),x].at n=49A129652
• Triangle, read by rows, T(n, k) = Sum_{j=0..k} (n+k)!/((n-j)!*(k-j)!*j!).at n=19A176080
• a(n) = n*(4*n - 3)*(16*n^2 - 12*n - 3).at n=6A264895
• Number of left-labeled (3,n)-bipartite graphs.at n=17A370081
• a(n) is the number of 5 element sets of distinct integer-sided trapezoids whose base angles are 60 degrees that fill an equilateral triangular grid of side n units formed by directly binary space partitioning 3-trapezoid sets without forming 4-trapezoid sets.at n=49A391203