# A002059 (b-file synthesized from sequence entry) 6 3 7 32 8 225 9 1320 10 7007 11 34944 12 167076 13 775200 14 3517470 15 15690048 16 69052555 17 300638520 18 1297398375 19 5557977600 20 23663585880 21 100222246080 22 422559514170 23 1774647576000 24 7427639542050 25 30994292561232 26 128989359164358