# A081370 (b-file synthesized from sequence entry) 1 1 2 30 3 105 4 120 5 132 6 231 7 252 8 380 9 495 10 520 11 595 12 616 13 630 14 680 15 756 16 858 17 870 18 924 19 1040 20 1155 21 1173 22 1365 23 1428 24 1463 25 1547 26 1610 27 1722 28 1768 29 1820 30 1953 31 1976 32 1995 33 2002 34 2016 35 2080 36 2093 37 2170 38 2184 39 2277 40 2310 41 2508 42 2520 43 2530 44 2552 45 2618 46 2622