# A129683 (b-file synthesized from sequence entry) 0 1 1 4 2 28 3 272 4 3344 5 49472 6 852928 7 16758016 8 369082624 9 8996922368 10 240294124544 11 6974172532736 12 218457925292032 13 7342688736329728 14 263513011737051136 15 10054112734940561408 16 406301504472849907712 17 17333090863574658842624 18 778298003006760943353856