# A002441 (b-file synthesized from sequence entry) 1 1 2 4 3 11 4 20 5 31 6 44 7 61 8 100 9 121 10 144 11 171 12 220 13 251 14 304 15 341 16 400 17 441 18 504 19 551 20 620 21 671 22 744 23 1021 24 1100 25 1161 26 1244 27 1331 28 1420 29 1511 30 1604 31 1701 32 2000 33 2101 34 2204 35 2311 36 2420 37 2531 38 2644 39 2761 40 3100 41 3221 42 3344 43 3471 44 3620 45 3751 46 4104 47 4241