# A064025 (b-file synthesized from sequence entry) 2 1 3 2 4 2 5 2 6 4 7 2 8 16 9 48 10 8 11 4 12 56 13 180 14 44 15 156 16 300 17 7936 18 10388 19 11516 20 9104 21 13469268 22 2684084 23 2418800 24 28468692 25 143007944 26 85509116 27 402570696 28 2287868888 29 204306960 30 48715166536 31 147160740856 32 317585614148