# A268430 (b-file synthesized from sequence entry) 0 1 1 2 2 5 3 16 4 53 5 184 6 654 7 2368 8 8689 9 32216 10 120434 11 453248 12 1715266 13 6521584 14 24894364 15 95353472 16 366324729 17 1411015064 18 5447548682 19 21074836864 20 81682204614 21 317110750672 22 1232951721604 23 4800353915264 24 18712880651802 25 73030245143792 26 285311648317172