# A148931 (b-file synthesized from sequence entry) 0 1 1 1 2 3 3 9 4 28 5 96 6 331 7 1178 8 4277 9 15668 10 58207 11 217827 12 820822 13 3113057 14 11858060 15 45369618 16 174201971 17 670880989 18 2590897603 19 10028967336 20 38902441680 21 151185031351 22 588509650239 23 2294305412573 24 8956328591359 25 35005542995118 26 136969955527081 27 536476427847843 28 2103186073322950