# A149373 (b-file synthesized from sequence entry) 0 1 1 1 2 4 3 12 4 46 5 174 6 703 7 2888 8 12148 9 51924 10 224551 11 982451 12 4331352 13 19247666 14 86027816 15 386632310 16 1745493623 17 7912474214 18 35995573003 19 164273095721 20 751821506551 21 3449621370468 22 15864629611684 23 73113526659709 24 337594692984764 25 1561539606796564 26 7234504448723448 27 33566690644670128