# A026712 (b-file synthesized from sequence entry) 0 1 1 3 2 8 3 20 4 47 5 111 6 252 7 582 8 1303 9 2977 10 6618 11 15028 12 33269 13 75255 14 166152 15 374860 16 826115 17 1860407 18 4094612 19 9208832 20 20248703 21 45495079 22 99965896 23 224440544 24 492900919 25 1106034259 26 2428024608 27 5446009600 28 11951707547