# A148393 (b-file synthesized from sequence entry) 0 1 1 1 2 2 3 5 4 16 5 52 6 183 7 664 8 2449 9 9362 10 36633 11 145270 12 586439 13 2398743 14 9905045 15 41348528 16 174110004 17 738361192 18 3154440182 19 13559465468 20 58601967026 21 254620276210 22 1111404780914 23 4871741807378 24 21440930894794 25 94702771111481 26 419700986590893 27 1865899431263205 28 8319362447227408