# A038060 (b-file synthesized from sequence entry) 0 1 1 3 2 6 3 18 4 75 5 342 6 1773 7 9894 8 58596 9 362061 10 2314119 11 15185223 12 101830986 13 695253993 14 4819762446 15 33851833506 16 240472935735 17 1725315714729 18 12487872432924 19 91097741283408 20 669227023979088 21 4947500029023540 22 36786363204267282 23 274949933519917908