# A148036 (b-file synthesized from sequence entry) 0 1 1 1 2 2 3 3 4 8 5 17 6 55 7 137 8 475 9 1281 10 4671 11 13561 12 51649 13 158164 14 619616 15 1970703 16 7889055 17 25897272 18 105597628 19 355925249 20 1472958168 21 5073075343 22 21248105272 23 74525835058 24 315355167249 25 1123653233699 26 4796820059745 27 17327386969144 28 74532011152878 29 272468321876405 30 1179733310810498 31 4358597694512184