# A231934 (b-file synthesized from sequence entry) 0 1 1 1 2 1 3 2 4 6 5 27 6 163 7 1271 8 12354 9 145801 10 2047083 11 33642256 12 638588460 13 13845027215 14 339607971556 15 9347964267192 16 286688210033698 17 9734737020358855 18 363942977852123850 19 14906164891970353970 20 665835978084064725837 21 32304867226779146102085 22 1696127595521806495181023