# A045697 (b-file synthesized from sequence entry) 1 0 2 0 3 1 4 0 5 2 6 8 7 24 8 70 9 214 10 638 11 1930 12 5782 13 17394 14 52160 15 156620 16 469786 17 1409786 18 4229148 19 12688720 20 38065506 21 114200378 22 342599212 23 1027809200 24 3083421770 25 9250300098 26 27750882922 27 83252753086 28 249758206958 29 749274934114 30 2247824645796 31 6743474876960