# A203523 (b-file synthesized from sequence entry) 1 1 2 5 3 140 4 25200 5 55036800 6 951035904000 7 222618484408320000 8 440079343769868042240000 9 12254449406615745504215040000000 10 7909254579604123100510930935480320000000 11 48073937540175558516708030362614204937011200000000