# A067913 (b-file synthesized from sequence entry) 1 1 2 28 3 30 4 52 5 231 6 277 7 523 8 2278 9 22749 10 48854 11 371305 12 1447522 13 1726931 14 1947729 15 3657998 16 6964377 17 14393316 18 101963994 19 237690542 20 487815056 21 1525407389 22 2636206007 23 14146907176 24 2348836787752 25 5367069498863 26 1710637374747486