# A246653 (b-file synthesized from sequence entry) 0 1 1 1 2 3 3 9 4 25 5 87 6 287 7 993 8 3519 9 12525 10 45369 11 165519 12 608569 13 2253307 14 8386575 15 31370297 16 117834837 17 444258387 18 1680516731 19 6375706325 20 24253227159 21 92481509389 22 353417696625 23 1353280137975 24 5191349266275 25 19948136148837 26 76771074483837 27 295880290515411 28 1141860205058433 29 4412129801125275