# A074663 (b-file synthesized from sequence entry) 1 2 2 4 3 7 4 14 5 31 6 84 7 195 8 482 9 1131 10 2620 11 5957 12 13502 13 29911 14 65820 15 143551 16 311074 17 669543 18 1435388 19 3061571 20 6503526 21 13771989 22 29061728 23 61159219 24 128372210 25 268845359 26 561835492 27 1171862289 28 2440014306 29 5072185867 30 10528184756