# A126373 (b-file synthesized from sequence entry) 0 1 1 19 2 55 3 161 4 473 5 1393 6 4109 7 12135 8 35871 9 106113 10 314093 11 930187 12 2755955 13 8168423 14 24218539 15 71826449 16 213075513 17 632242305 18 1876395357 19 5569898331 20 16536545331 21 49103259773 22 145827049265 23 433134662087 24 1286649627671