# A049177 (b-file synthesized from sequence entry) 1 1 2 1 3 3 4 11 5 45 6 197 7 903 8 4277 9 20773 10 102893 11 517771 12 2639571 13 13603509 14 70758321 15 370979823 16 1958471433 17 10401832121 18 55542275273 19 297991827555 20 1605599352347 21 8684388729741 22 47136082628653 23 256651601838839