# A011845 (b-file synthesized from sequence entry) 0 0 1 0 2 0 3 0 4 0 5 0 6 0 7 0 8 0 9 1 10 5 11 18 12 55 13 143 14 333 15 715 16 1430 17 2701 18 4862 19 8398 20 13996 21 22610 22 35530 23 54479 24 81719 25 120175 26 173586 27 246675 28 345345 29 476905 30 650325 31 876525 32 1168700 33 1542684 34 2017356 35 2615091 36 3362260 37 4289780 38 5433721 39 6835972 40 8544965 41 10616471