# A151484 (b-file synthesized from sequence entry) 0 1 1 1 2 4 3 15 4 61 5 269 6 1245 7 5935 8 29128 9 145871 10 743421 11 3843154 12 20108453 13 106304763 14 567011174 15 3047948601 16 16496553378 17 89828010025 18 491790403030 19 2705562067688 20 14949910812086 21 82936556715572 22 461770124064327 23 2579548304347117 24 14453779059407019 25 81214726367783785 26 457521215541829301