# A176750 (b-file synthesized from sequence entry) 0 1 1 4 2 7 3 29 4 113 5 506 6 2321 7 11112 8 54429 9 272364 10 1384701 11 7135397 12 37178543 13 195556526 14 1036967927 15 5537451445 16 29752654081 17 160731437308 18 872518135861 19 4756932856431 20 26035840213731 21 143003903810742 22 787983925181427