# A019485 (b-file synthesized from sequence entry) 0 2 1 5 2 12 3 28 4 65 5 150 6 346 7 797 8 1836 9 4228 10 9737 11 22422 12 51634 13 118901 14 273804 15 630508 16 1451921 17 3343446 18 7699210 19 17729549 20 40827180 21 94015828 22 216497369 23 498544854 24 1148036962 25 2643671525 26 6087782412 27 14018796988 28 32282144225 29 74338535190 30 171184967866