# A149268 (b-file synthesized from sequence entry) 0 1 1 1 2 4 3 11 4 40 5 147 6 537 7 2067 8 8090 9 31759 10 127226 11 512728 12 2085944 13 8530109 14 35108141 15 145290427 16 603473533 17 2516899058 18 10535376447 19 44235546052 20 186238821286 21 786137476704 22 3326533736676 23 14104293872530 24 59921599051958 25 255045546995888 26 1087354970834820 27 4643011158411006