# A099513 (b-file synthesized from sequence entry) 0 1 1 4 2 8 3 27 4 89 5 257 6 784 7 2421 8 7336 9 22324 10 68147 11 207549 12 632177 13 1926608 14 5870089 15 17884476 16 54493120 17 166034731 18 505883825 19 1541369745 20 4696373312 21 14309268413 22 43598614528 23 132839740908 24 404746601923 25 1233213978037