# A297201 (b-file synthesized from sequence entry) 0 1 1 2 2 4 3 10 4 34 5 148 6 786 7 4920 8 35446 9 288822 10 2625844 11 26349340 12 289248224 13 3447860798 14 44348374106 15 612228009210 16 9028698146956 17 141655958846642 18 2355980548168314 19 41403643674710280 20 766627753698325214