# A026649 (b-file synthesized from sequence entry) 0 1 1 3 2 8 3 36 4 114 5 558 6 1856 7 9384 8 31942 9 164322 10 566928 11 2948184 12 10262004 13 53761068 14 188306112 15 991821456 16 3490234182 17 18458523378 18 65190481904 19 345875613144 20 1225052975644 21 6516499594212 22 23134851823872 23 123325174525104