# A133592 (b-file synthesized from sequence entry) 0 1 1 2 2 8 3 28 4 104 5 376 6 1376 7 5008 8 18272 9 66592 10 242816 11 885184 12 3227264 13 11765632 14 42894848 15 156383488 16 570136064 17 2078573056 18 7577962496 19 27627363328 20 100722501632 21 367209183232 22 1338753376256 23 4880761851904 24 17794043961344