# A046650 (b-file synthesized from sequence entry) 2 1 3 1 4 2 5 4 6 14 7 49 8 216 9 984 10 4862 11 24739 12 130338 13 701584 14 3852744 15 21489836 16 121525520 17 695307888 18 4019381790 19 23446201495 20 137875564710 21 816646459860 22 4868578092510 23 29196022525905 24 176022392938080 25 1066433501134560 26 6490009570139784 27 39659537885087124 28 243278423033093336 29 1497584057249141728 30 9249144367260811824