# A019178 (b-file synthesized from sequence entry) 3 0 4 1 5 5 6 0 7 0 8 26 9 18 10 50 11 264 12 510 13 1222 14 3584 15 8220 16 19844 17 52190 18 130734 19 332766 20 870390 21 2262498 22 5894020 23 15453056 24 40601118 25 106899600 26 282117654 27 746795754 28 1981625744 29 5267084574 30 14033598060 31 37471928032