# A377237 (b-file synthesized from sequence entry) 0 1 1 2 2 10 3 56 4 326 5 1936 6 11644 7 70672 8 431942 9 2654816 10 16392564 11 101611536 12 631938524 13 3941350816 14 24643020344 15 154415141152 16 969445760070 17 6096812777664 18 38401653547204 19 242213348616592 20 1529642560685684 21 9671100898555168 22 61208631472013256 23 387759384222157152