# A084903 (b-file synthesized from sequence entry) 0 1 1 9 2 44 3 170 4 576 5 1792 6 5248 7 14688 8 39680 9 104192 10 267264 11 672256 12 1662976 13 4055040 14 9764864 15 23257088 16 54853632 17 128253952 18 297533440 19 685375488 20 1568669696 21 3569352704 22 8078229504 23 18192793600 24 40785412096 25 91049951232