270137domain: NAppears in sequencesExpansion of x^2*(43 -11*x -148*x^2 +23*x^3)/(1 -2*x -7*x^2 +7*x^3 +12*x^4 -2*x^5).at n=9A121957Number of compositions of n where the difference between largest and smallest parts equals 2 and adjacent parts are unequal.at n=33A214271