# A294815 (b-file synthesized from sequence entry) 0 1 1 1 2 2 3 6 4 21 5 75 6 265 7 927 8 3229 9 11253 10 39355 11 138362 12 489440 13 1742576 14 6244395 15 22516585 16 81673947 17 297894234 18 1092086024 19 4022418903 20 14879231036 21 55255415912 22 205931156743 23 769994355746 24 2887687533958 25 10859294097589 26 40939724979676 27 154701255400490 28 585829636549849 29 2222842322625552