# A005962 (b-file synthesized from sequence entry) 1 1 2 1 3 2 4 4 5 10 6 22 7 60 8 158 9 439 10 1229 11 3525 12 10178 13 29802 14 87862 15 261204 16 781198 17 2350249 18 7105081 19 21577415 20 65787902 21 201313311 22 618040002 23 1903102730 24 5876174472 25 18189503139 26 56435742554 27 175477142565 28 546703920430 29 1706433403626