124357194domain: NAppears in sequencesa(n) = 2 * 3^(n-2)*n*(1+2*n).at n=13A062189Expansion of x(3-x^2)/(1-3x).at n=17A114982Number of n X 2 0..2 arrays with some element plus some horizontally or vertically adjacent neighbor totalling two no more than once.at n=13A268622