# A193234 (b-file synthesized from sequence entry) 0 1 1 2 2 6 3 20 4 66 5 228 6 804 7 2872 8 10374 9 37780 10 138436 11 509832 12 1885396 13 6996472 14 26039592 15 97160592 16 363332534 17 1361320284 18 5109306148 19 19205627608 20 72292274076 21 272454449560 22 1027979651384 23 3882579544656 24 14677889406396 25 55536827825096