# A106376 (b-file synthesized from sequence entry) 1 2 2 5 3 10 4 24 5 52 6 121 7 258 8 616 9 1344 10 3128 11 6996 12 16160 13 36248 14 85041 15 191298 16 444168 17 1019328 18 2359392 19 5405488 20 12625336 21 29066304 22 67659824 23 156911364 24 365683744 25 849401072 26 1987046192 27 4624252776 28 10816019328