# A097682 (b-file synthesized from sequence entry) 0 1 1 8 2 64 3 512 4 4096 5 32768 6 262144 7 2097152 8 16817536 9 137443328 10 1215668224 11 13131579392 12 186802241536 13 3194809745408 14 57299125141504 15 1002518381330432 16 16747075923705856 17 268695698674024448 18 4294396462470529024