# A137155 (b-file synthesized from sequence entry) 0 1 1 1 2 2 3 3 4 5 5 9 6 17 7 35 8 80 9 201 10 561 11 1771 12 6298 13 25217 14 115440 15 605243 16 3609754 17 24742305 18 196470603 19 1792166979 20 18817616610 21 230233601737 22 3268914688382 23 53509699527491 24 1020486454701731 25 22777217813040393 26 589097686208575727