# A184786 (b-file synthesized from sequence entry) 0 1 1 1 2 2 3 8 4 35 5 147 6 654 7 3009 8 14219 9 68605 10 336623 11 1674517 12 8425573 13 42806200 14 219285459 15 1131431170 16 5874504011 17 30670279153 18 160916320637 19 847994498527 20 4486473924741 21 23821682237692 22 126897559943046 23 677992017255423