# A092439 (b-file synthesized from sequence entry) 0 0 1 0 2 6 3 30 4 140 5 560 6 2058 7 7098 8 23472 9 75372 10 237182 11 735878 12 2260596 13 6896136 14 20933778 15 63325170 16 191089112 17 575626052 18 1731858246 19 5206059774 20 15640198620 21 46966732320 22 140996664986 23 423191320490 24 1269993390720