# A149028 (b-file synthesized from sequence entry) 0 1 1 1 2 3 3 10 4 32 5 116 6 450 7 1727 8 6837 9 28060 10 115565 11 481369 12 2040532 13 8708109 14 37423501 15 162231361 16 707449871 17 3102033992 18 13670214098 19 60514683165 20 269035757552 21 1200266720500 22 5373244040392 23 24132690138088 24 108682252595942 25 490777845043766 26 2221711774517289 27 10079890026903695