# A120899 (b-file synthesized from sequence entry) 0 1 1 2 2 5 3 16 4 54 5 186 6 654 7 2338 8 8463 9 30938 10 114022 11 423096 12 1579049 13 5922512 14 22309350 15 84354388 16 320020227 17 1217689680 18 4645693038 19 17766596202 20 68092473570 21 261486788434 22 1005962436536 23 3876412305114 24 14960183283203