# A117882 (b-file synthesized from sequence entry) 0 1 1 4 2 13 3 44 4 141 5 447 6 1408 7 4428 8 13916 9 43725 10 137373 11 431577 12 1355846 13 4259523 14 13381694 15 42039839 16 132072059 17 414916622 18 1303499025 19 4095062974 20 12865019770 21 40416651612 22 126972655803 23 398896362696 24 1253169882609