# A019301 (b-file synthesized from sequence entry) 0 1 1 1 2 1 3 2 4 5 5 12 6 28 7 64 8 141 9 296 10 594 11 1156 12 2224 13 4304 14 8464 15 16928 16 34221 17 69328 18 139726 19 278940 20 550926 21 1078120 22 2097624 23 4076384 24 7950896 25 15629056 26 31038736 27 62302112 28 126196400 29 257199552