# A054855 (b-file synthesized from sequence entry) 0 1 1 1 2 8 3 21 4 93 5 314 6 1213 7 4375 8 16334 9 59925 10 221799 11 817280 12 3018301 13 11134189 14 41096528 15 151643937 16 559640289 17 2065192514 18 7621289593 19 28124714395 20 103789150046 21 383013144129 22 1413437041011 23 5216013647648 24 19248692843977