163956domain: NAppears in sequencesNumber of (2+1)X(n+1) arrays of permutations of 0..n*3+2 with each element having directed index change 0,0 0,1 1,0 or -1,-2.at n=9A264286Expansion of Sum_{k>0} x^(3*k)/(1 - k*x^k)^3.at n=27A363644G.f. satisfies A(x) = ( 1 + x * A(x)^(1/3) * (1 + A(x)) )^(3/2).at n=9A371724