# A049173 (b-file synthesized from sequence entry) 1 1 2 1 3 1 4 1 5 3 6 13 7 43 8 113 9 273 10 725 11 2245 12 7305 13 22875 14 68545 15 204247 16 626177 17 1977377 18 6301577 19 19965657 20 62913409 21 198797059 22 633412869 23 2032810979 24 6543426769 25 21071181585 26 67905492605 27 219347606365 28 710732629705