81440

Appears in sequences

• Numbers whose base-5 representation has exactly 8 runs.at n=24A043608
• Period (multiplicative order base 10) of the terms in A116074 and A116075.at n=13A116076
• Number of walks within N^3 (the first octant of Z^3) starting at (0,0,0) and consisting of n steps taken from {(-1, 0, 0), (-1, 0, 1), (0, -1, 0), (1, 1, 0), (1, 1, 1)}.at n=8A151023
• Number of 2nX6 0..4 arrays with values 0..4 introduced in row major order and each element equal to exactly two horizontal and vertical neighbors.at n=3A198248
• Number of 2nX8 0..4 arrays with values 0..4 introduced in row major order and each element equal to exactly two horizontal and vertical neighbors.at n=2A198249
• T(n,k)=Number of 2nX2k 0..4 arrays with values 0..4 introduced in row major order and each element equal to exactly two horizontal and vertical neighbors.at n=17A198253
• T(n,k)=Number of 2nX2k 0..4 arrays with values 0..4 introduced in row major order and each element equal to exactly two horizontal and vertical neighbors.at n=18A198253
• a(n) = Sum_{k=0..floor(n/3)} 2^(n-3*k) * binomial(2*k+1,2*n-6*k+1).at n=25A387652