# A075299 (b-file synthesized from sequence entry) 0 290 1 835 2 1610 3 4195 4 17060 5 23845 6 46490 7 89080 8 138125 9 255775 10 506510 11 1238395 12 5127260 13 8616205 14 15984335 15 31949470 16 79793675 17 315404860 18 569392925 19 1060061935 20 2114961710 21 5206421995 22 20997654620 23 35262166285