# A234291 (b-file synthesized from sequence entry) 0 1 1 1 2 4 3 34 4 460 5 8608 6 206152 7 6020992 8 207574240 9 8251015264 10 371527296256 11 18691127602816 12 1039066330203520 13 63253339835514112 14 4184830238170091008 15 298985971407749744128 16 22941517126450315985920 17 1881603821848104123344896 18 164271703613261014954276864