# A091983 (b-file synthesized from sequence entry) 0 1 1 20 2 180 3 560 4 1460 5 2520 6 5040 7 6880 8 11700 9 15140 10 22680 11 26640 12 40880 13 43960 14 61920 15 70560 16 93620 17 98280 18 136260 19 137200 20 183960 21 192640 22 239760 23 243360 24 327600 25 315020 26 395640 27 408800 28 502240 29 487800 30 635040 31 595840 32 748980 33 745920