1498176

Appears in sequences

• a(0)=1, a(1)=36, a(n)=204*a(n-2).at n=5A120465
• Number of reduced words of length n in Coxeter group on 18 generators S_i with relations (S_i)^2 = (S_i S_j)^4 = I.at n=5A163104
• Perfect squares that are a product of two distinct triangular numbers.at n=14A169836
• Total number of Y shapes in all tilings of a 5 X n rectangle with pentominoes of any shape.at n=8A247745
• Number of (4+1)X(n+1) arrays of permutations of 0..n*5+4 with each element having directed index change -1,0 0,2 -1,-2 or 1,0.at n=8A264522
• Coefficients in expansion of Eisenstein series -q*(d/dq)(q*(d/dq)E_2).at n=34A282154
• Squares in A378769.at n=30A378984