# A118649 (b-file synthesized from sequence entry) 0 1 1 2 2 5 3 12 4 30 5 74 6 184 7 456 8 1132 9 2808 10 6968 11 17288 12 42896 13 106432 14 264080 15 655232 16 1625760 17 4033824 18 10008704 19 24833536 20 61616832 21 152883328 22 379333248 23 941199488 24 2335298816 25 5794330112 26 14376858880 27 35671780352 28 88508618240