# A000333 (b-file synthesized from sequence entry) 1 1 2 5 3 15 4 40 5 98 6 237 7 534 8 1185 9 2554 10 5391 11 11117 12 22556 13 44858 14 88000 15 170107 16 324547 17 611755 18 1140382 19 2103554 20 3842826 21 6955918 22 12483075 23 22220002 24 39248230 25 68819781 26 119839422 27 207304370 28 356356801 29 608901907 30 1034452712 31 1747764522 32 2937370605 33 4911675955 34 8173032301