# A033191 (b-file synthesized from sequence entry) 0 1 1 1 2 2 3 5 4 14 5 42 6 132 7 429 8 1430 9 4861 10 16778 11 58598 12 206516 13 732825 14 2613834 15 9358677 16 33602822 17 120902914 18 435668420 19 1571649221 20 5674201118 21 20497829133 22 74079051906 23 267803779710 24 968355724724 25 3502058316337 26 12666676646162 27 45818284122149