# A037600 (b-file synthesized from sequence entry) 1 1 2 10 3 70 4 491 5 3440 6 24080 7 168561 8 1179930 9 8259510 10 57816571 11 404716000 12 2833012000 13 19831084001 14 138817588010 15 971723116070 16 6802061812491 17 47614432687440 18 333301028812080 19 2333107201684561