# A153535 (b-file synthesized from sequence entry) 0 1 1 2 2 4 3 7 4 11 5 16 6 38 7 113 8 342 9 975 10 2636 11 8729 12 35249 13 159811 14 757035 15 3630603 16 19165047 17 115453377 18 782498885 19 5793617152 20 45722686214 21 390614558026 22 3684092364605 23 38520543111851 24 443271652337403 25 5554115003205511