45880
domain: N
Appears in sequences
- a(n) = n*(n+1)*(n+2)*(n+7)/24.at n=30A005582
- The Wiener index of a chain of n triangles (i.e., joined like VVV..VV; here V is a triangle!).at n=39A143941
- Expansion of g.f. 1 - 2*x*(-7 - 10*x + x^2)/(x - 1)^4.at n=20A152100
- Number of active (ON, black) cells at stage 2^n-1 of the two-dimensional cellular automaton defined by "Rule 403", based on the 5-celled von Neumann neighborhood.at n=7A271808
- Starts of runs of 3 consecutive Pell-Niven numbers (A352320).at n=23A352322