# A148056 (b-file synthesized from sequence entry) 0 1 1 1 2 2 3 3 4 10 5 22 6 65 7 152 8 509 9 1466 10 4645 11 13532 12 44434 13 146454 14 483958 15 1573257 16 5245446 17 18189431 18 62918036 19 215842095 20 743114400 21 2625979396 22 9395162641 23 33370716692 24 118291958507 25 424227452507 26 1546163643295 27 5636678152183 28 20454730175647 29 74489593325489 30 274498234923989 31 1018318442708743